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1,421 commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Li Chen
|
1a47837bfa |
Documentation: document liveupdate cmdline parameter
liveupdate is used to enable Live Update Orchestrator (LUO) early during boot. Add it to kernel-parameters.txt so users can discover and use it. Link: https://lkml.kernel.org/r/20260130112036.359806-1-me@linux.beauty Signed-off-by: Li Chen <me@linux.beauty> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Frank van der Linden <fvdl@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kees Cook <kees@kernel.org> Cc: Li RongQing <lirongqing@baidu.com> Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Pratyush Yadav <ptyadav@amazon.de> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Marco Elver
|
6ac166a0c8 |
docs: kernel-parameters: add kfence parameters
Add a brief summary for KFENCE's kernel command-line parameters in admin-guide/kernel-parameters. Link: https://lkml.kernel.org/r/20251222150018.1349672-1-elver@google.com Signed-off-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Linus Torvalds
|
67a454e6b1 |
memblock: introduce check_pages boot parameter
... to decouple simple checks for page state on allocation and free from
CONFIG_DEBUG_VM.
check_pages parameter allows enabling page checking without building kernel
with CONFIG_DEBUG_VM or forcing init_on_{alloc, free} or other heavier
mechanisms.
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Merge tag 'memblock-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
Pull memblock update from Mike Rapoport:
"Introduce a 'check_pages' boot parameter to decouple simple checks for
page state on allocation and free from CONFIG_DEBUG_VM.
This allows enabling page checking without building kernel with
CONFIG_DEBUG_VM or forcing init_on_{alloc, free} or other heavier
mechanisms"
* tag 'memblock-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
mm/mm_init: Introduce a boot parameter for check_pages
|
||
|
Linus Torvalds
|
509d3f4584 |
Significant patch series in this pull request:
- The 6 patch series "panic: sys_info: Refactor and fix a potential
issue" from Andy Shevchenko fixes a build issue and does some cleanup in
ib/sys_info.c.
- The 9 patch series "Implement mul_u64_u64_div_u64_roundup()" from
David Laight enhances the 64-bit math code on behalf of a PWM driver and
beefs up the test module for these library functions.
- The 2 patch series "scripts/gdb/symbols: make BPF debug info available
to GDB" from Ilya Leoshkevich makes BPF symbol names, sizes, and line
numbers available to the GDB debugger.
- The 4 patch series "Enable hung_task and lockup cases to dump system
info on demand" from Feng Tang adds a sysctl which can be used to cause
additional info dumping when the hung-task and lockup detectors fire.
- The 6 patch series "lib/base64: add generic encoder/decoder, migrate
users" from Kuan-Wei Chiu adds a general base64 encoder/decoder to lib/
and migrates several users away from their private implementations.
- The 2 patch series "rbree: inline rb_first() and rb_last()" from Eric
Dumazet makes TCP a little faster.
- The 9 patch series "liveupdate: Rework KHO for in-kernel users" from
Pasha Tatashin reworks the KEXEC Handover interfaces in preparation for
Live Update Orchestrator (LUO), and possibly for other future clients.
- The 13 patch series "kho: simplify state machine and enable dynamic
updates" from Pasha Tatashin increases the flexibility of KEXEC
Handover. Also preparation for LUO.
- The 18 patch series "Live Update Orchestrator" from Pasha Tatashin is
a major new feature targeted at cloud environments. Quoting the [0/N]:
This series introduces the Live Update Orchestrator, a kernel subsystem
designed to facilitate live kernel updates using a kexec-based reboot.
This capability is critical for cloud environments, allowing hypervisors
to be updated with minimal downtime for running virtual machines. LUO
achieves this by preserving the state of selected resources, such as
memory, devices and their dependencies, across the kernel transition.
As a key feature, this series includes support for preserving memfd file
descriptors, which allows critical in-memory data, such as guest RAM or
any other large memory region, to be maintained in RAM across the kexec
reboot.
Mike Rappaport merits a mention here, for his extensive review and
testing work.
- The 3 patch series "kexec: reorganize kexec and kdump sysfs" from
Sourabh Jain moves the kexec and kdump sysfs entries from /sys/kernel/
to /sys/kernel/kexec/ and adds back-compatibility symlinks which can
hopefully be removed one day.
- The 2 patch series "kho: fixes for vmalloc restoration" from Mike
Rapoport fixes a BUG which was being hit during KHO restoration of
vmalloc() regions.
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Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "panic: sys_info: Refactor and fix a potential issue" (Andy Shevchenko)
fixes a build issue and does some cleanup in ib/sys_info.c
- "Implement mul_u64_u64_div_u64_roundup()" (David Laight)
enhances the 64-bit math code on behalf of a PWM driver and beefs up
the test module for these library functions
- "scripts/gdb/symbols: make BPF debug info available to GDB" (Ilya Leoshkevich)
makes BPF symbol names, sizes, and line numbers available to the GDB
debugger
- "Enable hung_task and lockup cases to dump system info on demand" (Feng Tang)
adds a sysctl which can be used to cause additional info dumping when
the hung-task and lockup detectors fire
- "lib/base64: add generic encoder/decoder, migrate users" (Kuan-Wei Chiu)
adds a general base64 encoder/decoder to lib/ and migrates several
users away from their private implementations
- "rbree: inline rb_first() and rb_last()" (Eric Dumazet)
makes TCP a little faster
- "liveupdate: Rework KHO for in-kernel users" (Pasha Tatashin)
reworks the KEXEC Handover interfaces in preparation for Live Update
Orchestrator (LUO), and possibly for other future clients
- "kho: simplify state machine and enable dynamic updates" (Pasha Tatashin)
increases the flexibility of KEXEC Handover. Also preparation for LUO
- "Live Update Orchestrator" (Pasha Tatashin)
is a major new feature targeted at cloud environments. Quoting the
cover letter:
This series introduces the Live Update Orchestrator, a kernel
subsystem designed to facilitate live kernel updates using a
kexec-based reboot. This capability is critical for cloud
environments, allowing hypervisors to be updated with minimal
downtime for running virtual machines. LUO achieves this by
preserving the state of selected resources, such as memory,
devices and their dependencies, across the kernel transition.
As a key feature, this series includes support for preserving
memfd file descriptors, which allows critical in-memory data, such
as guest RAM or any other large memory region, to be maintained in
RAM across the kexec reboot.
Mike Rappaport merits a mention here, for his extensive review and
testing work.
- "kexec: reorganize kexec and kdump sysfs" (Sourabh Jain)
moves the kexec and kdump sysfs entries from /sys/kernel/ to
/sys/kernel/kexec/ and adds back-compatibility symlinks which can
hopefully be removed one day
- "kho: fixes for vmalloc restoration" (Mike Rapoport)
fixes a BUG which was being hit during KHO restoration of vmalloc()
regions
* tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (139 commits)
calibrate: update header inclusion
Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"
vmcoreinfo: track and log recoverable hardware errors
kho: fix restoring of contiguous ranges of order-0 pages
kho: kho_restore_vmalloc: fix initialization of pages array
MAINTAINERS: TPM DEVICE DRIVER: update the W-tag
init: replace simple_strtoul with kstrtoul to improve lpj_setup
KHO: fix boot failure due to kmemleak access to non-PRESENT pages
Documentation/ABI: new kexec and kdump sysfs interface
Documentation/ABI: mark old kexec sysfs deprecated
kexec: move sysfs entries to /sys/kernel/kexec
test_kho: always print restore status
kho: free chunks using free_page() instead of kfree()
selftests/liveupdate: add kexec test for multiple and empty sessions
selftests/liveupdate: add simple kexec-based selftest for LUO
selftests/liveupdate: add userspace API selftests
docs: add documentation for memfd preservation via LUO
mm: memfd_luo: allow preserving memfd
liveupdate: luo_file: add private argument to store runtime state
mm: shmem: export some functions to internal.h
...
|
||
|
Linus Torvalds
|
416f99c3b1 |
Driver core changes for 6.19-rc1
- Arch Topology:
- Move parse_acpi_topology() from arm64 to common code for reuse in RISC-V
- CPU:
- Expose housekeeping CPUs through /sys/devices/system/cpu/housekeeping
- Print a newline (or 0x0A) instead of '(null)' reading
/sys/devices/system/cpu/nohz_full when nohz_full= is not set
- debugfs
- Remove (broken) 'no-mount' mode
- Remove redundant access mode checks in debugfs_get_tree() and
debugfs_create_*() functions
- Devres:
- Remove unused devm_free_percpu() helper
- Move devm_alloc_percpu() from device.h to devres.h
- Firmware Loader:
- Replace simple_strtol() with kstrtoint()
- Do not call cancel_store() when no upload is in progress
- kernfs:
- Increase struct super_block::maxbytes to MAX_LFS_FILESIZE
- Fix a missing unwind path in __kernfs_new_node()
- Misc:
- Increase the name size in struct auxiliary_device_id to 40 characters
- Replace system_unbound_wq with system_dfl_wq and add WQ_PERCPU to
alloc_workqueue()
- Platform:
- Replace ERR_PTR() with IOMEM_ERR_PTR() in platform ioremap functions
- Rust:
- Auxiliary:
- Unregister auxiliary device on parent device unbind
- Move parent() to impl Device; implement device context aware parent() for
Device<Bound>
- Illustrate how to safely obtain a driver's device private data when
calling from an auxiliary driver into the parant device driver
- DebugFs:
- Implement support for binary large objects
- Device:
- Let probe() return the driver's device private data as pinned initializer,
i.e. impl PinInit<Self, Error>
- Implement safe accessor for a driver's device private data for
Device<Bound> (returned reference can't out-live driver binding and
guarantees the correct private data type)
- Implement AsBusDevice trait, to be used by class device abstractions to
derive the bus device type of the parent device
- DMA:
- Store raw pointer of allocation as NonNull
- Use start_ptr() and start_ptr_mut() to inherit correct mutability of self
- FS:
- Add file::Offset type alias
- I2C:
- Add abstractions for I2C device / driver infrastructure
- Implement abstractions for manual I2C device registrations
- I/O:
- Use "kernel vertical" style for imports
- Define ResourceSize as resource_size_t
- Move ResourceSize to top-level I/O module
- Add type alias for phys_addr_t
- Implement Rust version of read_poll_timeout_atomic()
- PCI:
- Use "kernel vertical" style for imports
- Move I/O and IRQ infrastructure to separate files
- Add support for PCI interrupt vectors
- Implement TryInto<IrqRequest<'a>> for IrqVector<'a> to convert an
IrqVector bound to specific pci::Device into an IrqRequest bound to the
same pci::Device's parent Device
- Leverage pin_init_scope() to get rid of redundant Result in IRQ methods
- PinInit:
- Add {pin_}init_scope() to execute code before creating an initializer
- Platform:
- Leverage pin_init_scope() to get rid of redundant Result in IRQ methods
- Timekeeping:
- Implement abstraction of udelay()
- Uaccess:
- Implement read_slice_partial() and read_slice_file() for UserSliceReader
- Implement write_slice_partial() and write_slice_file() for UserSliceWriter
- sysfs
- Prepare the constification of struct attribute
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Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
Pull driver core updates from Danilo Krummrich:
"Arch Topology:
- Move parse_acpi_topology() from arm64 to common code for reuse in
RISC-V
CPU:
- Expose housekeeping CPUs through /sys/devices/system/cpu/housekeeping
- Print a newline (or 0x0A) instead of '(null)' reading
/sys/devices/system/cpu/nohz_full when nohz_full= is not set
debugfs
- Remove (broken) 'no-mount' mode
- Remove redundant access mode checks in debugfs_get_tree() and
debugfs_create_*() functions
Devres:
- Remove unused devm_free_percpu() helper
- Move devm_alloc_percpu() from device.h to devres.h
Firmware Loader:
- Replace simple_strtol() with kstrtoint()
- Do not call cancel_store() when no upload is in progress
kernfs:
- Increase struct super_block::maxbytes to MAX_LFS_FILESIZE
- Fix a missing unwind path in __kernfs_new_node()
Misc:
- Increase the name size in struct auxiliary_device_id to 40
characters
- Replace system_unbound_wq with system_dfl_wq and add WQ_PERCPU to
alloc_workqueue()
Platform:
- Replace ERR_PTR() with IOMEM_ERR_PTR() in platform ioremap
functions
Rust:
- Auxiliary:
- Unregister auxiliary device on parent device unbind
- Move parent() to impl Device; implement device context aware
parent() for Device<Bound>
- Illustrate how to safely obtain a driver's device private data
when calling from an auxiliary driver into the parant device
driver
- DebugFs:
- Implement support for binary large objects
- Device:
- Let probe() return the driver's device private data as pinned
initializer, i.e. impl PinInit<Self, Error>
- Implement safe accessor for a driver's device private data for
Device<Bound> (returned reference can't out-live driver binding
and guarantees the correct private data type)
- Implement AsBusDevice trait, to be used by class device
abstractions to derive the bus device type of the parent device
- DMA:
- Store raw pointer of allocation as NonNull
- Use start_ptr() and start_ptr_mut() to inherit correct
mutability of self
- FS:
- Add file::Offset type alias
- I2C:
- Add abstractions for I2C device / driver infrastructure
- Implement abstractions for manual I2C device registrations
- I/O:
- Use "kernel vertical" style for imports
- Define ResourceSize as resource_size_t
- Move ResourceSize to top-level I/O module
- Add type alias for phys_addr_t
- Implement Rust version of read_poll_timeout_atomic()
- PCI:
- Use "kernel vertical" style for imports
- Move I/O and IRQ infrastructure to separate files
- Add support for PCI interrupt vectors
- Implement TryInto<IrqRequest<'a>> for IrqVector<'a> to convert
an IrqVector bound to specific pci::Device into an IrqRequest
bound to the same pci::Device's parent Device
- Leverage pin_init_scope() to get rid of redundant Result in IRQ
methods
- PinInit:
- Add {pin_}init_scope() to execute code before creating an
initializer
- Platform:
- Leverage pin_init_scope() to get rid of redundant Result in IRQ
methods
- Timekeeping:
- Implement abstraction of udelay()
- Uaccess:
- Implement read_slice_partial() and read_slice_file() for
UserSliceReader
- Implement write_slice_partial() and write_slice_file() for
UserSliceWriter
sysfs:
- Prepare the constification of struct attribute"
* tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (75 commits)
rust: pci: fix build failure when CONFIG_PCI_MSI is disabled
debugfs: Fix default access mode config check
debugfs: Remove broken no-mount mode
debugfs: Remove redundant access mode checks
driver core: Check drivers_autoprobe for all added devices
driver core: WQ_PERCPU added to alloc_workqueue users
driver core: replace use of system_unbound_wq with system_dfl_wq
tick/nohz: Expose housekeeping CPUs in sysfs
tick/nohz: avoid showing '(null)' if nohz_full= not set
sysfs/cpu: Use DEVICE_ATTR_RO for nohz_full attribute
kernfs: fix memory leak of kernfs_iattrs in __kernfs_new_node
fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE
mod_devicetable: Bump auxiliary_device_id name size
sysfs: simplify attribute definition macros
samples/kobject: constify 'struct foo_attribute'
samples/kobject: add is_visible() callback to attribute group
sysfs: attribute_group: enable const variants of is_visible()
sysfs: introduce __SYSFS_FUNCTION_ALTERNATIVE()
sysfs: transparently handle const pointers in ATTRIBUTE_GROUPS()
sysfs: attribute_group: allow registration of const attribute
...
|
||
|
Linus Torvalds
|
ad952db4a8 |
powerpc updates for 6.19
- Restore clearing of MSR[RI] at interrupt/syscall exit on 32-bit. - Fix unpaired stwcx on interrupt exit on 32-bit. - Fix race condition leading to double list-add in mac_hid_toggle_emumouse(). - Fix mprotect on book3s 32-bit. - Fix SLB multihit issue during SLB preload with 64-bit hash MMU. - Add support for crashkernel CMA reservation. - Add die_id and die_cpumask for Power10 & later to expose chip hemispheres. - A series of minor fixes and improvements to the hash SLB code. Thanks to: Antonio Alvarez Feijoo, Ben Collins, Bhaskar Chowdhury, Christophe Leroy, Daniel Thompson, Dave Vasilevsky, Donet Tom, J. Neuschäfer, Kunwu Chan, Long Li, Naresh Kamboju, Nathan Chancellor, Ritesh Harjani (IBM), Shirisha G, Shrikanth Hegde, Sourabh Jain, Srikar Dronamraju, Stephen Rothwell, Thomas Zimmermann, Venkat Rao Bagalkote, Vishal Chourasia. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRjvi15rv0TSTaE+SIF0oADX8seIQUCaTFrpQAKCRAF0oADX8se IaVSAPwJazU+gxYwIe9mB7Mt9w1N04voW7LmX4tcj83i/Xd5QgEAsXfdpYeo3Tvb VPIOXVGVxOxAccyQ7Yw5QF4BPv+8FAc= =h6Ed -----END PGP SIGNATURE----- Merge tag 'powerpc-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Restore clearing of MSR[RI] at interrupt/syscall exit on 32-bit - Fix unpaired stwcx on interrupt exit on 32-bit - Fix race condition leading to double list-add in mac_hid_toggle_emumouse() - Fix mprotect on book3s 32-bit - Fix SLB multihit issue during SLB preload with 64-bit hash MMU - Add support for crashkernel CMA reservation - Add die_id and die_cpumask for Power10 & later to expose chip hemispheres - A series of minor fixes and improvements to the hash SLB code Thanks to Antonio Alvarez Feijoo, Ben Collins, Bhaskar Chowdhury, Christophe Leroy, Daniel Thompson, Dave Vasilevsky, Donet Tom, J. Neuschäfer, Kunwu Chan, Long Li, Naresh Kamboju, Nathan Chancellor, Ritesh Harjani (IBM), Shirisha G, Shrikanth Hegde, Sourabh Jain, Srikar Dronamraju, Stephen Rothwell, Thomas Zimmermann, Venkat Rao Bagalkote, and Vishal Chourasia. * tag 'powerpc-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (32 commits) macintosh/via-pmu-backlight: Include <linux/fb.h> and <linux/of.h> powerpc/powermac: backlight: Include <linux/of.h> powerpc/64s/slb: Add no_slb_preload early cmdline param powerpc/64s/slb: Make preload_add return type as void powerpc/ptdump: Dump PXX level info for kernel_page_tables powerpc/64s/pgtable: Enable directMap counters in meminfo for Hash powerpc/64s/hash: Update directMap page counters for Hash powerpc/64s/hash: Hash hpt_order should be only available with Hash MMU powerpc/64s/hash: Improve hash mmu printk messages powerpc/64s/hash: Fix phys_addr_t printf format in htab_initialize() powerpc/64s/ptdump: Fix kernel_hash_pagetable dump for ISA v3.00 HPTE format powerpc/64s/hash: Restrict stress_hpt_struct memblock region to within RMA limit powerpc/64s/slb: Fix SLB multihit issue during SLB preload powerpc, mm: Fix mprotect on book3s 32-bit powerpc/smp: Expose die_id and die_cpumask powerpc/83xx: Add a null pointer check to mcu_gpiochip_add arch:powerpc:tools This file was missing shebang line, so added it kexec: Include kernel-end even without crashkernel powerpc: p2020: Rename wdt@ nodes to watchdog@ powerpc: 86xx: Rename wdt@ nodes to watchdog@ ... |
||
Joshua Hahn
|
83c8f7b5e1 |
mm/mm_init: Introduce a boot parameter for check_pages
Use-after-free and double-free bugs can be very difficult to track down.
The kernel is good at tracking these and preventing bad pages from being
used/created through simple checks gated behind "check_pages_enabled".
Currently, the only ways to enable this flag is by building with
CONFIG_DEBUG_VM, or as a side effect of other checks such as
init_on_{alloc, free}, page_poisoning, or debug_pagealloc among others.
These solutions are powerful, but may often be too coarse in balancing
the performance vs. safety that a user may want, particularly in
latency-sensitive production environments.
Introduce a new boot parameter "check_pages", which enables page checking
with no other side effects. It takes kstrbool-able inputs as an argument
(i.e. 0/1, true/false, on/off, ...). This patch is backwards-compatible;
setting CONFIG_DEBUG_VM still enables page checking.
Acked-by: SeongJae Park <sj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Link: https://patch.msgid.link/20251201180739.2330474-1-joshua.hahnjy@gmail.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
|
||
|
Linus Torvalds
|
f96163865a |
This has been another busy cycle for documentation, with a lot of
build-system thrashing. That work should slow down from here on out.
- The various scripts and tools for documentation were spread out in
several directories; now they are (almost) all coalesced under
tools/docs/. The holdout is the kernel-doc script, which cannot be
easily moved without some further thought.
- As the amount of Python code increases, we are accumulating modules that
are imported by multiple programs. These modules have been pulled
together under tools/lib/python/ -- at least, for documentation-related
programs. There is other Python code in the tree that might eventually
want to move toward this organization.
- The Perl kernel-doc.pl script has been removed. It is no longer used by
default, and nobody has missed it, least of all anybody who actually had
to look at it.
- The docs build was controlled by a complex mess of makefilese that few
dared to touch. Mauro has moved that logic into a new program
(tools/docs/sphinx-build-wrapper) that, with any luck at all, will be far
easier to understand and maintain.
- The get_feat.pl program, used to access information under
Documentation/features/, has been rewritten in Python, bringing an end to
the use of Perl in the docs subsystem.
- The top-level README file has been reorganized into a more
reader-friendly presentation.
- A lot of Chinese translation additions
- Typo fixes and documentation updates as usual
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Merge tag 'docs-6.19' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet:
"This has been another busy cycle for documentation, with a lot of
build-system thrashing. That work should slow down from here on out.
- The various scripts and tools for documentation were spread out in
several directories; now they are (almost) all coalesced under
tools/docs/. The holdout is the kernel-doc script, which cannot be
easily moved without some further thought.
- As the amount of Python code increases, we are accumulating modules
that are imported by multiple programs. These modules have been
pulled together under tools/lib/python/ -- at least, for
documentation-related programs. There is other Python code in the
tree that might eventually want to move toward this organization.
- The Perl kernel-doc.pl script has been removed. It is no longer
used by default, and nobody has missed it, least of all anybody who
actually had to look at it.
- The docs build was controlled by a complex mess of makefilese that
few dared to touch. Mauro has moved that logic into a new program
(tools/docs/sphinx-build-wrapper) that, with any luck at all, will
be far easier to understand and maintain.
- The get_feat.pl program, used to access information under
Documentation/features/, has been rewritten in Python, bringing an
end to the use of Perl in the docs subsystem.
- The top-level README file has been reorganized into a more
reader-friendly presentation.
- A lot of Chinese translation additions
- Typo fixes and documentation updates as usual"
* tag 'docs-6.19' of git://git.lwn.net/linux: (164 commits)
docs: makefile: move rustdoc check to the build wrapper
README: restructure with role-based documentation and guidelines
docs: kdoc: various fixes for grammar, spelling, punctuation
docs: kdoc_parser: use '@' for Excess enum value
docs: submitting-patches: Clarify that removal of Acks needs explanation too
docs: kdoc_parser: add data/function attributes to ignore
docs: MAINTAINERS: update Mauro's files/paths
docs/zh_CN: Add wd719x.rst translation
docs/zh_CN: Add libsas.rst translation
get_feat.pl: remove it, as it got replaced by get_feat.py
Documentation/sphinx/kernel_feat.py: use class directly
tools/docs/get_feat.py: convert get_feat.pl to Python
Documentation/admin-guide: fix typo and comment in cscope example
docs/zh_CN: Add data-integrity.rst translation
docs/zh_CN: Add blk-mq.rst translation
docs/zh_CN: Add block/index.rst translation
docs/zh_CN: Update the Chinese translation of kbuild.rst
docs: bring some order to our Python module hierarchy
docs: Move the python libraries to tools/lib/python
Documentation/kernel-parameters: Move the kernel build options
...
|
||
|
Linus Torvalds
|
d348c22394 |
Power management updates for 6.19-rc1
- Introduce and document a QoS limit on CPU exit latency during wakeup
from suspend-to-idle (Ulf Hansson)
- Add support for building libcpupower statically (Zuo An)
- Add support for sending netlink notifications to user space on energy
model updates (Changwoo Mini, Peng Fan)
- Minor improvements to the Rust OPP interface (Tamir Duberstein)
- Fixes to scope-based pointers in the OPP library (Viresh Kumar)
- Use residency threshold in polling state override decisions in the
menu cpuidle governor (Aboorva Devarajan)
- Add sanity check for exit latency and target residency in the cpufreq
core (Rafael Wysocki)
- Use this_cpu_ptr() where possible in the teo governor (Christian
Loehle)
- Rework the handling of tick wakeups in the teo cpuidle governor to
increase the likelihood of stopping the scheduler tick in the cases
when tick wakeups can be counted as non-timer ones (Rafael Wysocki)
- Fix a reverse condition in the teo cpuidle governor and drop a
misguided target residency check from it (Rafael Wysocki)
- Clean up multiple minor defects in the teo cpuidle governor (Rafael
Wysocki)
- Update header inclusion to make it follow the Include What You Use
principle (Andy Shevchenko)
- Enable MSR-based RAPL PMU support in the intel_rapl power capping
driver and arrange for using it on the Panther Lake and Wildcat Lake
processors (Kuppuswamy Sathyanarayanan)
- Add support for Nova Lake and Wildcat Lake processors to the
intel_rapl power capping driver (Kaushlendra Kumar, Srinivas
Pandruvada)
- Add OPP and bandwidth support for Tegra186 (Aaron Kling)
- Optimizations for parameter array handling in the amd-pstate cpufreq
driver (Mario Limonciello)
- Fix for mode changes with offline CPUs in the amd-pstate cpufreq
driver (Gautham Shenoy)
- Preserve freq_table_sorted across suspend/hibernate in the cpufreq
core (Zihuan Zhang)
- Adjust energy model rules for Intel hybrid platforms in the
intel_pstate cpufreq driver and improve printing of debug messages
in it (Rafael Wysocki)
- Replace deprecated strcpy() in cpufreq_unregister_governor()
(Thorsten Blum)
- Fix duplicate hyperlink target errors in the intel_pstate cpufreq
driver documentation and use :ref: directive for internal linking in
it (Swaraj Gaikwad, Bagas Sanjaya)
- Add Diamond Rapids OOB mode support to the intel_pstate cpufreq
driver (Kuppuswamy Sathyanarayanan)
- Use mutex guard for driver locking in the intel_pstate driver and
eliminate some code duplication from it (Rafael Wysocki)
- Replace udelay() with usleep_range() in ACPI cpufreq (Kaushlendra
Kumar)
- Minor improvements to various cpufreq drivers (Christian Marangi, Hal
Feng, Jie Zhan, Marco Crivellari, Miaoqian Lin, and Shuhao Fu)
- Replace snprintf() with scnprintf() in show_trace_dev_match()
(Kaushlendra Kumar)
- Fix memory allocation error handling in pm_vt_switch_required()
(Malaya Kumar Rout)
- Introduce CALL_PM_OP() macro and use it to simplify code in
generic PM operations (Kaushlendra Kumar)
- Add module param to backtrace all CPUs in the device power management
watchdog (Sergey Senozhatsky)
- Rework message printing in swsusp_save() (Rafael Wysocki)
- Make it possible to change the number of hibernation compression
threads (Xueqin Luo)
- Clarify that only cgroup1 freezer uses PM freezer (Tejun Heo)
- Add document on debugging shutdown hangs to PM documentation and
correct a mistaken configuration option in it (Mario Limonciello)
- Shut down wakeup source timer before removing the wakeup source from
the list (Kaushlendra Kumar, Rafael Wysocki)
- Introduce new PMSG_POWEROFF event for system shutdown handling with
the help of PM device callbacks (Mario Limonciello)
- Make pm_test delay interruptible by wakeup events (Riwen Lu)
- Clean up kernel-doc comment style usage in the core hibernation
code and remove unuseful comments from it (Sunday Adelodun, Rafael
Wysocki)
- Add support for handling wakeup events and aborting the suspend
process while it is syncing file systems (Samuel Wu, Rafael Wysocki)
- Add WQ_UNBOUND to pm_wq workqueue (Marco Crivellari)
- Add runtime PM wrapper macros for ACQUIRE()/ACQUIRE_ERR() and use
them in the PCI core and the ACPI TAD driver (Rafael Wysocki)
- Improve runtime PM in the ACPI TAD driver (Rafael Wysocki)
- Update pm_runtime_allow/forbid() documentation (Rafael Wysocki)
- Fix typos in runtime.c comments (Malaya Kumar Rout)
- Move governor.h from devfreq under include/linux/ and rename to
devfreq-governor.h to allow devfreq governor definitions in out
of drivers/devfreq/ (Dmitry Baryshkov)
- Use min() to improve readability in tegra30-devfreq.c (Thorsten
Blum)
- Fix potential use-after-free issue of OPP handling in
hisi_uncore_freq.c (Pengjie Zhang)
- Fix typo in DFSO_DOWNDIFFERENTIAL macro name in
governor_simpleondemand.c in devfreq (Riwen Lu)
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Merge tag 'pm-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki:
"There are quite a few interesting things here, including new hardware
support, new features, some bug fixes and documentation updates. In
addition, there are a usual bunch of minor fixes and cleanups all
over.
In the new hardware support category, there are intel_pstate and
intel_rapl driver updates to support new processors, Panther Lake,
Wildcat Lake, Noval Lake, and Diamond Rapids in the OOB mode, OPP and
bandwidth allocation support in the tegra186 cpufreq driver, and
JH7110S SOC support in dt-platdev cpufreq.
The new features are the PM QoS CPU latency limit for suspend-to-idle,
the netlink support for the energy model management, support for
terminating system suspend via a wakeup event during the sync of file
systems, configurable number of hibernation compression threads, the
runtime PM auto-cleanup macros, and the "poweroff" PM event that is
expected to be used during system shutdown.
Bugs are mostly fixed in cpuidle governors, but there are also fixes
elsewhere, like in the amd-pstate cpufreq driver.
Documentation updates include, but are not limited to, a new doc on
debugging shutdown hangs, cross-referencing fixes and cleanups in the
intel_pstate documentation, and updates of comments in the core
hibernation code.
Specifics:
- Introduce and document a QoS limit on CPU exit latency during
wakeup from suspend-to-idle (Ulf Hansson)
- Add support for building libcpupower statically (Zuo An)
- Add support for sending netlink notifications to user space on
energy model updates (Changwoo Mini, Peng Fan)
- Minor improvements to the Rust OPP interface (Tamir Duberstein)
- Fixes to scope-based pointers in the OPP library (Viresh Kumar)
- Use residency threshold in polling state override decisions in the
menu cpuidle governor (Aboorva Devarajan)
- Add sanity check for exit latency and target residency in the
cpufreq core (Rafael Wysocki)
- Use this_cpu_ptr() where possible in the teo governor (Christian
Loehle)
- Rework the handling of tick wakeups in the teo cpuidle governor to
increase the likelihood of stopping the scheduler tick in the cases
when tick wakeups can be counted as non-timer ones (Rafael Wysocki)
- Fix a reverse condition in the teo cpuidle governor and drop a
misguided target residency check from it (Rafael Wysocki)
- Clean up multiple minor defects in the teo cpuidle governor (Rafael
Wysocki)
- Update header inclusion to make it follow the Include What You Use
principle (Andy Shevchenko)
- Enable MSR-based RAPL PMU support in the intel_rapl power capping
driver and arrange for using it on the Panther Lake and Wildcat
Lake processors (Kuppuswamy Sathyanarayanan)
- Add support for Nova Lake and Wildcat Lake processors to the
intel_rapl power capping driver (Kaushlendra Kumar, Srinivas
Pandruvada)
- Add OPP and bandwidth support for Tegra186 (Aaron Kling)
- Optimizations for parameter array handling in the amd-pstate
cpufreq driver (Mario Limonciello)
- Fix for mode changes with offline CPUs in the amd-pstate cpufreq
driver (Gautham Shenoy)
- Preserve freq_table_sorted across suspend/hibernate in the cpufreq
core (Zihuan Zhang)
- Adjust energy model rules for Intel hybrid platforms in the
intel_pstate cpufreq driver and improve printing of debug messages
in it (Rafael Wysocki)
- Replace deprecated strcpy() in cpufreq_unregister_governor()
(Thorsten Blum)
- Fix duplicate hyperlink target errors in the intel_pstate cpufreq
driver documentation and use :ref: directive for internal linking
in it (Swaraj Gaikwad, Bagas Sanjaya)
- Add Diamond Rapids OOB mode support to the intel_pstate cpufreq
driver (Kuppuswamy Sathyanarayanan)
- Use mutex guard for driver locking in the intel_pstate driver and
eliminate some code duplication from it (Rafael Wysocki)
- Replace udelay() with usleep_range() in ACPI cpufreq (Kaushlendra
Kumar)
- Minor improvements to various cpufreq drivers (Christian Marangi,
Hal Feng, Jie Zhan, Marco Crivellari, Miaoqian Lin, and Shuhao Fu)
- Replace snprintf() with scnprintf() in show_trace_dev_match()
(Kaushlendra Kumar)
- Fix memory allocation error handling in pm_vt_switch_required()
(Malaya Kumar Rout)
- Introduce CALL_PM_OP() macro and use it to simplify code in generic
PM operations (Kaushlendra Kumar)
- Add module param to backtrace all CPUs in the device power
management watchdog (Sergey Senozhatsky)
- Rework message printing in swsusp_save() (Rafael Wysocki)
- Make it possible to change the number of hibernation compression
threads (Xueqin Luo)
- Clarify that only cgroup1 freezer uses PM freezer (Tejun Heo)
- Add document on debugging shutdown hangs to PM documentation and
correct a mistaken configuration option in it (Mario Limonciello)
- Shut down wakeup source timer before removing the wakeup source
from the list (Kaushlendra Kumar, Rafael Wysocki)
- Introduce new PMSG_POWEROFF event for system shutdown handling with
the help of PM device callbacks (Mario Limonciello)
- Make pm_test delay interruptible by wakeup events (Riwen Lu)
- Clean up kernel-doc comment style usage in the core hibernation
code and remove unuseful comments from it (Sunday Adelodun, Rafael
Wysocki)
- Add support for handling wakeup events and aborting the suspend
process while it is syncing file systems (Samuel Wu, Rafael
Wysocki)
- Add WQ_UNBOUND to pm_wq workqueue (Marco Crivellari)
- Add runtime PM wrapper macros for ACQUIRE()/ACQUIRE_ERR() and use
them in the PCI core and the ACPI TAD driver (Rafael Wysocki)
- Improve runtime PM in the ACPI TAD driver (Rafael Wysocki)
- Update pm_runtime_allow/forbid() documentation (Rafael Wysocki)
- Fix typos in runtime.c comments (Malaya Kumar Rout)
- Move governor.h from devfreq under include/linux/ and rename to
devfreq-governor.h to allow devfreq governor definitions in out of
drivers/devfreq/ (Dmitry Baryshkov)
- Use min() to improve readability in tegra30-devfreq.c (Thorsten
Blum)
- Fix potential use-after-free issue of OPP handling in
hisi_uncore_freq.c (Pengjie Zhang)
- Fix typo in DFSO_DOWNDIFFERENTIAL macro name in
governor_simpleondemand.c in devfreq (Riwen Lu)"
* tag 'pm-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (96 commits)
PM / devfreq: Fix typo in DFSO_DOWNDIFFERENTIAL macro name
cpuidle: Warn instead of bailing out if target residency check fails
cpuidle: Update header inclusion
Documentation: power/cpuidle: Document the CPU system wakeup latency QoS
cpuidle: Respect the CPU system wakeup QoS limit for cpuidle
sched: idle: Respect the CPU system wakeup QoS limit for s2idle
pmdomain: Respect the CPU system wakeup QoS limit for cpuidle
pmdomain: Respect the CPU system wakeup QoS limit for s2idle
PM: QoS: Introduce a CPU system wakeup QoS limit
cpuidle: governors: teo: Add missing space to the description
PM: hibernate: Extra cleanup of comments in swap handling code
PM / devfreq: tegra30: use min to simplify actmon_cpu_to_emc_rate
PM / devfreq: hisi: Fix potential UAF in OPP handling
PM / devfreq: Move governor.h to a public header location
powercap: intel_rapl: Enable MSR-based RAPL PMU support
powercap: intel_rapl: Prepare read_raw() interface for atomic-context callers
cpufreq: qcom-nvmem: fix compilation warning for qcom_cpufreq_ipq806x_match_list
PM: sleep: Call pm_sleep_fs_sync() instead of ksys_sync_helper()
PM: sleep: Add support for wakeup during filesystem sync
cpufreq: ACPI: Replace udelay() with usleep_range()
...
|
||
|
Linus Torvalds
|
2ae20d6510 |
- Add support for AMD's Smart Data Cache Injection feature which allows
for direct insertion of data from I/O devices into the L3 cache, thus bypassing DRAM and saving its bandwidth; the resctrl side of the feature allows the size of the L3 used for data injection to be controlled - Add Intel Clearwater Forest to the list of CPUs which support Sub-NUMA clustering - Other fixes and cleanups -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmktpFQACgkQEsHwGGHe VUop4g/9GTb/5rcFMQzeGlG3USnJOqJ+SmiAalA9lm1c933en9tqUgL/K0C0xC6h yraB3ICuob1YayiZkBwKIOQiei9gmfhH/CGf5vLcZMM+D6fqvlk1D+C40SuFoDFV DOH3H2nYoJ3vbZRtRZsD3bv/djST/OVk28g7eY8OwpZIwN5VSFULJwjK1ePPy+nL l65s/yrgLY0oLDBCGxtJ9gVxjCBqAoqfbbwVbcJm5hXv+2sYk8BH6de/CU+0v/vo K6Qu4GbmWqDKYH9thjC4ZC/DPXjtoCxGkg/l1Af5T1PiZF0ZtgEZI6i9JTR33jYJ 7j6BpkCwPzY07MKj/Ub1RemlMfY4XMN/qssEfFmnwG+aMBtbojNAjdb00Pu9Ffn+ TKFKiZ6WBTcYhqPQsFVruwHh8wDbJp2/x/yBfjD4qovo1HuyCln4iGDmoFcU2wTD UlOXW89bxOT56A3FL77ElnOg9nRltvdKduOluGtkpSkmBbzmDfoXrhG2z9zuuAui FB6GT2c5MRVXEC4BY30xwQBG5MArVRMyz9uYDyXf9+KHhWVdmq9K0ZAkIaUmPCvy BvBXpRhfxm/dKJPhtSuUPhh5A+a87gqoiu1McaFoVGyjVJIJ5gflge8+/mLj1lQz kG56SnLOzdtcwKcmQ5ncv5EkrTBD1Ph12u1kcd+4IZwkpgGZteE= =o7Dg -----END PGP SIGNATURE----- Merge tag 'x86_cache_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 resource control updates from Borislav Petkov: - Add support for AMD's Smart Data Cache Injection feature which allows for direct insertion of data from I/O devices into the L3 cache, thus bypassing DRAM and saving its bandwidth; the resctrl side of the feature allows the size of the L3 used for data injection to be controlled - Add Intel Clearwater Forest to the list of CPUs which support Sub-NUMA clustering - Other fixes and cleanups * tag 'x86_cache_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: fs/resctrl: Update bit_usage to reflect io_alloc fs/resctrl: Introduce interface to modify io_alloc capacity bitmasks fs/resctrl: Modify struct rdt_parse_data to pass mode and CLOSID fs/resctrl: Introduce interface to display io_alloc CBMs fs/resctrl: Add user interface to enable/disable io_alloc feature fs/resctrl: Introduce interface to display "io_alloc" support x86,fs/resctrl: Implement "io_alloc" enable/disable handlers x86,fs/resctrl: Detect io_alloc feature x86/resctrl: Add SDCIAE feature in the command line options x86/cpufeatures: Add support for L3 Smart Data Cache Injection Allocation Enforcement fs/resctrl: Consider sparse masks when initializing new group's allocation x86/resctrl: Support Sub-NUMA Cluster (SNC) mode on Clearwater Forest |
||
Aaron Thompson
|
f278809475 |
debugfs: Remove broken no-mount mode
debugfs access modes were added in Linux 5.10 (Dec 2020) [1], but the no-mount mode has behaved effectively the same as the off mode since Linux 5.12 (Apr 2021) [2]. The only difference is the specific error code returned by the debugfs_create_* functions, which is -ENOENT in no-mount mode and -EPERM in off mode. Given that no-mount hasn't worked for several years with no complaints, just remove it. [1] |
||
Babu Moger
|
4d4840b125 |
x86/resctrl: Add SDCIAE feature in the command line options
Add a kernel command-line parameter to enable or disable the exposure of the L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE) hardware feature to resctrl. Signed-off-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://patch.msgid.link/c623edf7cb369ba9da966de47d9f1b666778a40e.1762995456.git.babu.moger@amd.com |
||
Borislav Petkov (AMD)
|
f690e07859 |
Documentation/kernel-parameters: Move the kernel build options
Move the kernel build options abbreviations to the .txt file so that they are together instead of one having to go hunt them in the .rst file. Tweak the formatting so that the inclusion of kernel-parameters.txt still keeps the whole thing somewhat presentable in the html output too. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20251112114641.8230-1-bp@kernel.org> |
||
Xie Yuanbin
|
46a47693e1 |
Documentation/kernel-parameters: fix typo in retbleed= kernel parameter description
Fixes a typo in the retbleed= parameter description, changing
"migitation" to "mitigation".
Fixes:
|
||
Ritesh Harjani (IBM)
|
5b3a426aff |
powerpc/64s/slb: Add no_slb_preload early cmdline param
no_slb_preload cmdline can come useful in quickly disabling and/or testing the performance impact of userspace slb preloads. Recently there was a slb multi-hit issue due to slb preload cache which was very difficult to triage. This cmdline option allows to quickly disable preloads and verify if the issue exists in preload cache or somewhere else. This can also be a useful option to see the effect of slb preloads for any application workload e.g. number of slb faults with or w/o slb preloads. with slb_preload: slb_faults (minimal initrd boot): 15 slb_faults (full systemd boot): 300 with no_slb_preload: slb_faults (minimal initrd boot): 33 slb_faults (full systemd boot): 138180 Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/de484b55c45d831bc2db63945f455153c89a9a65.1761834163.git.ritesh.list@gmail.com |
||
Li RongQing
|
9544f9e694 |
hung_task: panic when there are more than N hung tasks at the same time
The hung_task_panic sysctl is currently a blunt instrument: it's all or nothing. Panicking on a single hung task can be an overreaction to a transient glitch. A more reliable indicator of a systemic problem is when multiple tasks hang simultaneously. Extend hung_task_panic to accept an integer threshold, allowing the kernel to panic only when N hung tasks are detected in a single scan. This provides finer control to distinguish between isolated incidents and system-wide failures. The accepted values are: - 0: Don't panic (unchanged) - 1: Panic on the first hung task (unchanged) - N > 1: Panic after N hung tasks are detected in a single scan The original behavior is preserved for values 0 and 1, maintaining full backward compatibility. [lance.yang@linux.dev: new changelog] Link: https://lkml.kernel.org/r/20251015063615.2632-1-lirongqing@baidu.com Signed-off-by: Li RongQing <lirongqing@baidu.com> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Reviewed-by: Lance Yang <lance.yang@linux.dev> Tested-by: Lance Yang <lance.yang@linux.dev> Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au> [aspeed_g5_defconfig] Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Hildenbrand <david@redhat.com> Cc: Florian Wesphal <fw@strlen.de> Cc: Jakub Kacinski <kuba@kernel.org> Cc: Jason A. Donenfeld <jason@zx2c4.com> Cc: Joel Granados <joel.granados@kernel.org> Cc: Joel Stanley <joel@jms.id.au> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Phil Auld <pauld@redhat.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Shuah Khan <shuah@kernel.org> Cc: Simon Horman <horms@kernel.org> Cc: Stanislav Fomichev <sdf@fomichev.me> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Sourabh Jain
|
b4a96ab50f |
powerpc/kdump: Add support for crashkernel CMA reservation
Commit |
||
Thomas Gleixner
|
9c37cb6e80 |
rseq: Provide static branch for runtime debugging
Config based debug is rarely turned on and is not available easily when things go wrong. Provide a static branch to allow permanent integration of debug mechanisms along with the usual toggles in Kconfig, command line and debugfs. Requested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/20251027084307.089270547@linutronix.de |
||
Xueqin Luo
|
090bf5a0f4 |
PM: hibernate: make compression threads configurable
The number of compression/decompression threads has a direct impact on
hibernate image generation and resume latency. Using more threads can
reduce overall resume time, but on systems with fewer CPU cores it may
also introduce contention and reduce efficiency.
Performance was evaluated on an 8-core ARM system, averaged over 10 runs:
Threads Hibernate(s) Resume(s)
--------------------------------
3 12.14 18.86
4 12.28 17.48
5 11.09 16.77
6 11.08 16.44
With 5–6 threads, resume latency improves by approximately 12% compared
to the default 3-thread configuration, with negligible impact on
hibernate time.
Introduce a new kernel parameter `hibernate_compression_threads=` that
allows users and integrators to tune the number of
compression/decompression threads at boot. This provides a way to
balance performance and CPU utilization across a wide range of hardware
without recompiling the kernel.
Signed-off-by: Xueqin Luo <luoxueqin@kylinos.cn>
Link: https://patch.msgid.link/f24b3ca6416e230a515a154ed4c121d72a7e05a6.1761046167.git.luoxueqin@kylinos.cn
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
||
Yohei Kojima
|
04623798aa |
docs: admin-guide: Fix a typo in kernel-parameters.txt
Fix a typo in the stacktrace parameter description in kernel-parameters.txt Signed-off-by: Yohei Kojima <Yohei.Kojima@sony.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <edda15e3fcae13265278d3c3bd93ab077345d78f.1760498951.git.Yohei.Kojima@sony.com> |
||
|
Linus Torvalds
|
9591fdb061 |
- Remove a bunch of asm implementing condition flags testing in KVM's
emulator in favor of int3_emulate_jcc() which is written in C - Replace KVM fastops with C-based stubs which avoids problems with the fastop infra related to latter not adhering to the C ABI due to their special calling convention and, more importantly, bypassing compiler control-flow integrity checking because they're written in asm - Remove wrongly used static branches and other ugliness accumulated over time in hyperv's hypercall implementation with a proper static function call to the correct hypervisor call variant - Add some fixes and modifications to allow running FRED-enabled kernels in KVM even on non-FRED hardware - Add kCFI improvements like validating indirect calls and prepare for enabling kCFI with GCC. Add cmdline params documentation and other code cleanups - Use the single-byte 0xd6 insn as the official #UD single-byte undefined opcode instruction as agreed upon by both x86 vendors - Other smaller cleanups and touchups all over the place -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmjqXxkACgkQEsHwGGHe VUq9QBAAsjaay99a1+Dc53xyP1/HzCUFZDOzEYhj9zF85I8/xA9vTXZr7Qg2m6os +4EEmnlwU43AR5KgwGJcuszLF9qSqTMz5qkAdFpvnoQ1Hbc8b49A+3yo9/hM7NA2 gPGH0gVZVBcffoETiQ8tJN6C9H6Ec0nTZwKTbasWwxz5oUAw+ppjP+aF4rFQ2/5w b1ofrcga5yucjvSlXjBOEwHvd21l7O9iMre1oGEn6b0E2LU8ldToRkJkVZIhkWeL 2Iq3gYtVNN4Ao06WbV/EfXAqg5HWXjcm5bLcUXDtSF+Blae+gWoCjrT7XQdQGyEq J12l4FbIZk5Ha8eWAC425ye9i3Wwo+oie3Cc4SVCMdv5A+AmOF0ijAlo1hcxq0rX eGNWm8BKJOJ9zz1kxLISO7CfjULKgpsXLabF5a19uwoCsQgj5YrhlJezaIKHXbnK OWwHWg9IuRkN2KLmJa7pXtHkuAHp4MtEV9TP9kU2WCvCInrNrzp3gYtds3pri82c 8ove+WA3yb/AQ6RCq5vAMLYXBxMRbN7FrmY5ZuwgWJTMi6cp1Sp02mhobwJOgNhO H7nKWCZnQMyCLPzVeg97HTSgqSXw13dSrujWX9gWYVWBMfZO1B9HcUrhtiOhH7Q9 cvELkcqaxKrCKdRHLLYgHeMIQU2tdpsQ5TXHm7C7liEcZPZpk+g= =3Otb -----END PGP SIGNATURE----- Merge tag 'x86_core_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull more x86 updates from Borislav Petkov: - Remove a bunch of asm implementing condition flags testing in KVM's emulator in favor of int3_emulate_jcc() which is written in C - Replace KVM fastops with C-based stubs which avoids problems with the fastop infra related to latter not adhering to the C ABI due to their special calling convention and, more importantly, bypassing compiler control-flow integrity checking because they're written in asm - Remove wrongly used static branches and other ugliness accumulated over time in hyperv's hypercall implementation with a proper static function call to the correct hypervisor call variant - Add some fixes and modifications to allow running FRED-enabled kernels in KVM even on non-FRED hardware - Add kCFI improvements like validating indirect calls and prepare for enabling kCFI with GCC. Add cmdline params documentation and other code cleanups - Use the single-byte 0xd6 insn as the official #UD single-byte undefined opcode instruction as agreed upon by both x86 vendors - Other smaller cleanups and touchups all over the place * tag 'x86_core_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits) x86,retpoline: Optimize patch_retpoline() x86,ibt: Use UDB instead of 0xEA x86/cfi: Remove __noinitretpoline and __noretpoline x86/cfi: Add "debug" option to "cfi=" bootparam x86/cfi: Standardize on common "CFI:" prefix for CFI reports x86/cfi: Document the "cfi=" bootparam options x86/traps: Clarify KCFI instruction layout compiler_types.h: Move __nocfi out of compiler-specific header objtool: Validate kCFI calls x86/fred: KVM: VMX: Always use FRED for IRQs when CONFIG_X86_FRED=y x86/fred: Play nice with invoking asm_fred_entry_from_kvm() on non-FRED hardware x86/fred: Install system vector handlers even if FRED isn't fully enabled x86/hyperv: Use direct call to hypercall-page x86/hyperv: Clean up hv_do_hypercall() KVM: x86: Remove fastops KVM: x86: Convert em_salc() to C KVM: x86: Introduce EM_ASM_3WCL KVM: x86: Introduce EM_ASM_1SRC2 KVM: x86: Introduce EM_ASM_2CL KVM: x86: Introduce EM_ASM_2W ... |
||
|
Linus Torvalds
|
256e341706 |
Generic:
* Rework almost all of KVM's exports to expose symbols only to KVM's x86
vendor modules (kvm-{amd,intel}.ko and PPC's kvm-{pr,hv}.ko.
x86:
* Rework almost all of KVM x86's exports to expose symbols only to KVM's
vendor modules, i.e. to kvm-{amd,intel}.ko.
* Add support for virtualizing Control-flow Enforcement Technology (CET) on
Intel (Shadow Stacks and Indirect Branch Tracking) and AMD (Shadow Stacks).
It's worth noting that while SHSTK and IBT can be enabled separately in CPUID,
it is not really possible to virtualize them separately. Therefore, Intel
processors will really allow both SHSTK and IBT under the hood if either is
made visible in the guest's CPUID. The alternative would be to intercept
XSAVES/XRSTORS, which is not feasible for performance reasons.
* Fix a variety of fuzzing WARNs all caused by checking L1 intercepts when
completing userspace I/O. KVM has already committed to allowing L2 to
to perform I/O at that point.
* Emulate PERF_CNTR_GLOBAL_STATUS_SET for PerfMonV2 guests, as the MSR is
supposed to exist for v2 PMUs.
* Allow Centaur CPU leaves (base 0xC000_0000) for Zhaoxin CPUs.
* Add support for the immediate forms of RDMSR and WRMSRNS, sans full
emulator support (KVM should never need to emulate the MSRs outside of
forced emulation and other contrived testing scenarios).
* Clean up the MSR APIs in preparation for CET and FRED virtualization, as
well as mediated vPMU support.
* Clean up a pile of PMU code in anticipation of adding support for mediated
vPMUs.
* Reject in-kernel IOAPIC/PIT for TDX VMs, as KVM can't obtain EOI vmexits
needed to faithfully emulate an I/O APIC for such guests.
* Many cleanups and minor fixes.
* Recover possible NX huge pages within the TDP MMU under read lock to
reduce guest jitter when restoring NX huge pages.
* Return -EAGAIN during prefault if userspace concurrently deletes/moves the
relevant memslot, to fix an issue where prefaulting could deadlock with the
memslot update.
x86 (AMD):
* Enable AVIC by default for Zen4+ if x2AVIC (and other prereqs) is supported.
* Require a minimum GHCB version of 2 when starting SEV-SNP guests via
KVM_SEV_INIT2 so that invalid GHCB versions result in immediate errors
instead of latent guest failures.
* Add support for SEV-SNP's CipherText Hiding, an opt-in feature that prevents
unauthorized CPU accesses from reading the ciphertext of SNP guest private
memory, e.g. to attempt an offline attack. This feature splits the shared
SEV-ES/SEV-SNP ASID space into separate ranges for SEV-ES and SEV-SNP guests,
therefore a new module parameter is needed to control the number of ASIDs
that can be used for VMs with CipherText Hiding vs. how many can be used to
run SEV-ES guests.
* Add support for Secure TSC for SEV-SNP guests, which prevents the untrusted
host from tampering with the guest's TSC frequency, while still allowing the
the VMM to configure the guest's TSC frequency prior to launch.
* Validate the XCR0 provided by the guest (via the GHCB) to avoid bugs
resulting from bogus XCR0 values.
* Save an SEV guest's policy if and only if LAUNCH_START fully succeeds to
avoid leaving behind stale state (thankfully not consumed in KVM).
* Explicitly reject non-positive effective lengths during SNP's LAUNCH_UPDATE
instead of subtly relying on guest_memfd to deal with them.
* Reload the pre-VMRUN TSC_AUX on #VMEXIT for SEV-ES guests, not the host's
desired TSC_AUX, to fix a bug where KVM was keeping a different vCPU's
TSC_AUX in the host MSR until return to userspace.
KVM (Intel):
* Preparation for FRED support.
* Don't retry in TDX's anti-zero-step mitigation if the target memslot is
invalid, i.e. is being deleted or moved, to fix a deadlock scenario similar
to the aforementioned prefaulting case.
* Misc bugfixes and minor cleanups.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull x86 kvm updates from Paolo Bonzini:
"Generic:
- Rework almost all of KVM's exports to expose symbols only to KVM's
x86 vendor modules (kvm-{amd,intel}.ko and PPC's kvm-{pr,hv}.ko
x86:
- Rework almost all of KVM x86's exports to expose symbols only to
KVM's vendor modules, i.e. to kvm-{amd,intel}.ko
- Add support for virtualizing Control-flow Enforcement Technology
(CET) on Intel (Shadow Stacks and Indirect Branch Tracking) and AMD
(Shadow Stacks).
It is worth noting that while SHSTK and IBT can be enabled
separately in CPUID, it is not really possible to virtualize them
separately. Therefore, Intel processors will really allow both
SHSTK and IBT under the hood if either is made visible in the
guest's CPUID. The alternative would be to intercept
XSAVES/XRSTORS, which is not feasible for performance reasons
- Fix a variety of fuzzing WARNs all caused by checking L1 intercepts
when completing userspace I/O. KVM has already committed to
allowing L2 to to perform I/O at that point
- Emulate PERF_CNTR_GLOBAL_STATUS_SET for PerfMonV2 guests, as the
MSR is supposed to exist for v2 PMUs
- Allow Centaur CPU leaves (base 0xC000_0000) for Zhaoxin CPUs
- Add support for the immediate forms of RDMSR and WRMSRNS, sans full
emulator support (KVM should never need to emulate the MSRs outside
of forced emulation and other contrived testing scenarios)
- Clean up the MSR APIs in preparation for CET and FRED
virtualization, as well as mediated vPMU support
- Clean up a pile of PMU code in anticipation of adding support for
mediated vPMUs
- Reject in-kernel IOAPIC/PIT for TDX VMs, as KVM can't obtain EOI
vmexits needed to faithfully emulate an I/O APIC for such guests
- Many cleanups and minor fixes
- Recover possible NX huge pages within the TDP MMU under read lock
to reduce guest jitter when restoring NX huge pages
- Return -EAGAIN during prefault if userspace concurrently
deletes/moves the relevant memslot, to fix an issue where
prefaulting could deadlock with the memslot update
x86 (AMD):
- Enable AVIC by default for Zen4+ if x2AVIC (and other prereqs) is
supported
- Require a minimum GHCB version of 2 when starting SEV-SNP guests
via KVM_SEV_INIT2 so that invalid GHCB versions result in immediate
errors instead of latent guest failures
- Add support for SEV-SNP's CipherText Hiding, an opt-in feature that
prevents unauthorized CPU accesses from reading the ciphertext of
SNP guest private memory, e.g. to attempt an offline attack. This
feature splits the shared SEV-ES/SEV-SNP ASID space into separate
ranges for SEV-ES and SEV-SNP guests, therefore a new module
parameter is needed to control the number of ASIDs that can be used
for VMs with CipherText Hiding vs. how many can be used to run
SEV-ES guests
- Add support for Secure TSC for SEV-SNP guests, which prevents the
untrusted host from tampering with the guest's TSC frequency, while
still allowing the the VMM to configure the guest's TSC frequency
prior to launch
- Validate the XCR0 provided by the guest (via the GHCB) to avoid
bugs resulting from bogus XCR0 values
- Save an SEV guest's policy if and only if LAUNCH_START fully
succeeds to avoid leaving behind stale state (thankfully not
consumed in KVM)
- Explicitly reject non-positive effective lengths during SNP's
LAUNCH_UPDATE instead of subtly relying on guest_memfd to deal with
them
- Reload the pre-VMRUN TSC_AUX on #VMEXIT for SEV-ES guests, not the
host's desired TSC_AUX, to fix a bug where KVM was keeping a
different vCPU's TSC_AUX in the host MSR until return to userspace
KVM (Intel):
- Preparation for FRED support
- Don't retry in TDX's anti-zero-step mitigation if the target
memslot is invalid, i.e. is being deleted or moved, to fix a
deadlock scenario similar to the aforementioned prefaulting case
- Misc bugfixes and minor cleanups"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (142 commits)
KVM: x86: Export KVM-internal symbols for sub-modules only
KVM: x86: Drop pointless exports of kvm_arch_xxx() hooks
KVM: x86: Move kvm_intr_is_single_vcpu() to lapic.c
KVM: Export KVM-internal symbols for sub-modules only
KVM: s390/vfio-ap: Use kvm_is_gpa_in_memslot() instead of open coded equivalent
KVM: VMX: Make CR4.CET a guest owned bit
KVM: selftests: Verify MSRs are (not) in save/restore list when (un)supported
KVM: selftests: Add coverage for KVM-defined registers in MSRs test
KVM: selftests: Add KVM_{G,S}ET_ONE_REG coverage to MSRs test
KVM: selftests: Extend MSRs test to validate vCPUs without supported features
KVM: selftests: Add support for MSR_IA32_{S,U}_CET to MSRs test
KVM: selftests: Add an MSR test to exercise guest/host and read/write
KVM: x86: Define AMD's #HV, #VC, and #SX exception vectors
KVM: x86: Define Control Protection Exception (#CP) vector
KVM: x86: Add human friendly formatting for #XM, and #VE
KVM: SVM: Enable shadow stack virtualization for SVM
KVM: SEV: Synchronize MSR_IA32_XSS from the GHCB when it's valid
KVM: SVM: Pass through shadow stack MSRs as appropriate
KVM: SVM: Update dump_vmcb with shadow stack save area additions
KVM: nSVM: Save/load CET Shadow Stack state to/from vmcb12/vmcb02
...
|
||
|
Linus Torvalds
|
ee2fe81cdc |
It has been a relatively busy cycle in docsland, with changes all over:
- Bring the kernel memory-model docs into the Sphinx build in the "literal
include" mode.
- Lots of build-infrastructure work, further cleaning up long-term
kernel-doc technical debt. The sphinx-pre-install tool has been
converted to Python and updated for current systems.
- A new tool to detect when documents have been moved and generate HTML
redirects; this can be used on kernel.org (or any other site hosting the
rendered docs) to avoid breaking links.
- Automated processing of the YAML files describing the netlink protocol.
- A significant update of the maintainer's PGP guide.
...and a seemingly endless series of typo fixes, build-problem fixes, etc.
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Merge tag 'docs-6.18' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet:
"It has been a relatively busy cycle in docsland, with changes all
over:
- Bring the kernel memory-model docs into the Sphinx build in the
"literal include" mode.
- Lots of build-infrastructure work, further cleaning up long-term
kernel-doc technical debt. The sphinx-pre-install tool has been
converted to Python and updated for current systems.
- A new tool to detect when documents have been moved and generate
HTML redirects; this can be used on kernel.org (or any other site
hosting the rendered docs) to avoid breaking links.
- Automated processing of the YAML files describing the netlink
protocol.
- A significant update of the maintainer's PGP guide.
... and a seemingly endless series of typo fixes, build-problem fixes,
etc"
* tag 'docs-6.18' of git://git.lwn.net/linux: (193 commits)
Documentation/features: Update feature lists for 6.17-rc7
docs: remove cdomain.py
Documentation/process: submitting-patches: fix typo in "were do"
docs: dev-tools/lkmm: Fix typo of missing file extension
Documentation: trace: histogram: Convert ftrace docs cross-reference
Documentation: trace: histogram-design: Wrap introductory note in note:: directive
Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram
Documentation: trace: histogram-design: Trim trailing vertices in diagram explanation text
Documentation: trace: histogram: Fix histogram trigger subsection number order
docs: driver-api: fix spelling of "buses".
Documentation: fbcon: Use admonition directives
Documentation: fbcon: Reindent 8th step of attach/detach/unload
Documentation: fbcon: Add boot options and attach/detach/unload section headings
docs: filesystems: sysfs: add remaining top level sysfs directory descriptions
docs: filesystems: sysfs: clarify symlink destinations in dev and bus/devices descriptions
docs: filesystems: sysfs: remove top level sysfs net directory
docs: maintainer: Fix ambiguous subheading formatting
docs: kdoc: a few more dump_typedef() tweaks
docs: kdoc: remove redundant comment stripping in dump_typedef()
docs: kdoc: remove some dead code in dump_typedef()
...
|
||
|
Linus Torvalds
|
e406d57be7 |
Patch series in this pull request:
- The 3 patch series "ida: Remove the ida_simple_xxx() API" from Christophe Jaillet completes the removal of this legacy IDR API. - The 9 patch series "panic: introduce panic status function family" from Jinchao Wang provides a number of cleanups to the panic code and its various helpers, which were rather ad-hoc and scattered all over the place. - The 5 patch series "tools/delaytop: implement real-time keyboard interaction support" from Fan Yu adds a few nice user-facing usability changes to the delaytop monitoring tool. - The 3 patch series "efi: Fix EFI boot with kexec handover (KHO)" from Evangelos Petrongonas fixes a panic which was happening with the combination of EFI and KHO. - The 2 patch series "Squashfs: performance improvement and a sanity check" from Phillip Lougher teaches squashfs's lseek() about SEEK_DATA/SEEK_HOLE. A mere 150x speedup was measured for a well-chosen microbenchmark. - Plus another 50-odd singleton patches all over the place. -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCaN78zwAKCRDdBJ7gKXxA jhLeAQCddTv0XtSUTrvBvmrJVUBrQQeJc+LtNopMIjfAF/WAWAEAogSVKxg+HHEB GaVixx4zDriNzEqrqiCx9rm4l+YooQA= =XRe0 -----END PGP SIGNATURE----- Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull non-MM updates from Andrew Morton: - "ida: Remove the ida_simple_xxx() API" from Christophe Jaillet completes the removal of this legacy IDR API - "panic: introduce panic status function family" from Jinchao Wang provides a number of cleanups to the panic code and its various helpers, which were rather ad-hoc and scattered all over the place - "tools/delaytop: implement real-time keyboard interaction support" from Fan Yu adds a few nice user-facing usability changes to the delaytop monitoring tool - "efi: Fix EFI boot with kexec handover (KHO)" from Evangelos Petrongonas fixes a panic which was happening with the combination of EFI and KHO - "Squashfs: performance improvement and a sanity check" from Phillip Lougher teaches squashfs's lseek() about SEEK_DATA/SEEK_HOLE. A mere 150x speedup was measured for a well-chosen microbenchmark - plus another 50-odd singleton patches all over the place * tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (75 commits) Squashfs: reject negative file sizes in squashfs_read_inode() kallsyms: use kmalloc_array() instead of kmalloc() MAINTAINERS: update Sibi Sankar's email address Squashfs: add SEEK_DATA/SEEK_HOLE support Squashfs: add additional inode sanity checking lib/genalloc: fix device leak in of_gen_pool_get() panic: remove CONFIG_PANIC_ON_OOPS_VALUE ocfs2: fix double free in user_cluster_connect() checkpatch: suppress strscpy warnings for userspace tools cramfs: fix incorrect physical page address calculation kernel: prevent prctl(PR_SET_PDEATHSIG) from racing with parent process exit Squashfs: fix uninit-value in squashfs_get_parent kho: only fill kimage if KHO is finalized ocfs2: avoid extra calls to strlen() after ocfs2_sprintf_system_inode_name() kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths sched/task.h: fix the wrong comment on task_lock() nesting with tasklist_lock coccinelle: platform_no_drv_owner: handle also built-in drivers coccinelle: of_table: handle SPI device ID tables lib/decompress: use designated initializers for struct compress_format efi: support booting with kexec handover (KHO) ... |
||
|
Linus Torvalds
|
3b2074c77d |
A set of updates for the interrupt core subsystem:
- Introduce irq_chip_[startup|shutdown]_parent() to prepare for
addressing a few short comings in the PCI/MSI interrupt subsystem.
It allows to utilize the interrupt chip startup/shutdown callbacks for
initializing the interrupt chip hierarchy properly on certain RISCV
implementations and provides a mechanism to reduce the overhead of
masking and unmasking PCI/MSI interrupts during operation when the
underlying MSI provider can mask the interrupt.
The actual usage comes with the interrupt driver pull request.
- Add generic error handling for devm_request_*_irq()
This allows to remove the zoo of random error printk's all over the
usage sites.
- Add a mechanism to warn about long-running interrupt handlers
Long running interrupt handlers can introduce latencies and tracking
them down is a tedious task. The tracking has to be enabled with a
threshold on the kernel command line and utilizes a static branch to
remove the overhead when disabled.
- Update and extend the selftests which validate the CPU hotplug
interrupt migration logic
- Allow dropping the per CPU softirq lock on PREEMPT_RT kernels, which
causes contention and latencies all over the place.
The serialization requirements have been pushed down into the actual
affected usage sites already.
- The usual small cleanups and improvements
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Merge tag 'irq-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq core updates from Thomas Gleixner:
"A set of updates for the interrupt core subsystem:
- Introduce irq_chip_[startup|shutdown]_parent() to prepare for
addressing a few short comings in the PCI/MSI interrupt subsystem.
It allows to utilize the interrupt chip startup/shutdown callbacks
for initializing the interrupt chip hierarchy properly on certain
RISCV implementations and provides a mechanism to reduce the
overhead of masking and unmasking PCI/MSI interrupts during
operation when the underlying MSI provider can mask the interrupt.
The actual usage comes with the interrupt driver pull request.
- Add generic error handling for devm_request_*_irq()
This allows to remove the zoo of random error printk's all over the
usage sites.
- Add a mechanism to warn about long-running interrupt handlers
Long running interrupt handlers can introduce latencies and
tracking them down is a tedious task. The tracking has to be
enabled with a threshold on the kernel command line and utilizes a
static branch to remove the overhead when disabled.
- Update and extend the selftests which validate the CPU hotplug
interrupt migration logic
- Allow dropping the per CPU softirq lock on PREEMPT_RT kernels,
which causes contention and latencies all over the place.
The serialization requirements have been pushed down into the
actual affected usage sites already.
- The usual small cleanups and improvements"
* tag 'irq-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT
softirq: Provide a handshake for canceling tasklets via polling
genirq/test: Ensure CPU 1 is online for hotplug test
genirq/test: Drop CONFIG_GENERIC_IRQ_MIGRATION assumptions
genirq/test: Depend on SPARSE_IRQ
genirq/test: Fail early if interrupt request fails
genirq/test: Factor out fake-virq setup
genirq/test: Select IRQ_DOMAIN
genirq/test: Fix depth tests on architectures with NOREQUEST by default.
genirq: Add support for warning on long-running interrupt handlers
genirq/devres: Add error handling in devm_request_*_irq()
genirq: Add irq_chip_(startup/shutdown)_parent()
genirq: Remove GENERIC_IRQ_LEGACY
|
||
|
Linus Torvalds
|
2cb8eeaf00 |
- Add support on AMD for assigning QOS bandwidth counters to resources
(RMIDs) with the ability for those resources to be tracked by the counters as long as they're assigned to them. Previously, due to hw limitations, bandwidth counts from untracked resources would get lost when those resources are not tracked. Refactor the code and user interfaces to be able to also support other, similar features on ARM, for example -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmjWZ+cACgkQEsHwGGHe VUoRrRAAjy/bn0gQCJPPySUfUa7rTG/qiriI6Ax9tc09X8ahspeUQ0IHCK1RWNwm tpzbsrTQImA8AeBkNbnD6ALKGSZdfL1l0hMZkKr1Htg35JoHSDMIalxab+sYCfg8 cysw0tmEKQce1wC8PtP4iX6ENbci4thS6td/t8rWcWTg1ndfOF9eTKHtZvZ/W0Qr zJ8MnBIqNhPMV0VEUxacmLuqPGnyWuXyIXzX9nHTc3fjSzTc94jqIB20wFBRFPAx EVFivq/mpu3uXXvvumuZZzXuqgBTIMMx2KjABw+5LNU9BIvkzoFwYZvRlUoU9es8 ASSBddt2jvYyHLal8MUXYieIHJAESKOe2apxtP74ZJIR0t7pUswobPyYO0GEseuQ +H2QbLlmJGNO3kJZUuSUGZ9yfjW4JsqM5UlowlVoHGvAOXIW+wR6r1tbdErfima9 rkqwUCzCXJg3UJ+a6xrK7hhc7QsbIHoo8mHBD+q5I1Hoipwoqe7j6YV80Oely/IC Gy3mFQ3e/KwRplfO7qHT88sfAAh+J+TmsVQTHlM62wrnjQOOPcMm7r9m0A2eTOme 7ZlvcU2q9nAJBaA8ylXbBt4l2AcFKaJg8btskWiZLAXGIjAb6B+5uepmwPRavY5Q NdiVa3pk7vGDl9oJ2DJIFKbq3adr50TCCarUM0304s3BsQvKnX4= =2FMs -----END PGP SIGNATURE----- Merge tag 'x86_cache_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 resource control updates from Borislav Petkov: "Add support on AMD for assigning QoS bandwidth counters to resources (RMIDs) with the ability for those resources to be tracked by the counters as long as they're assigned to them. Previously, due to hw limitations, bandwidth counts from untracked resources would get lost when those resources are not tracked. Refactor the code and user interfaces to be able to also support other, similar features on ARM, for example" * tag 'x86_cache_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits) fs/resctrl: Fix counter auto-assignment on mkdir with mbm_event enabled MAINTAINERS: resctrl: Add myself as reviewer x86/resctrl: Configure mbm_event mode if supported fs/resctrl: Introduce the interface to switch between monitor modes fs/resctrl: Disable BMEC event configuration when mbm_event mode is enabled fs/resctrl: Introduce the interface to modify assignments in a group fs/resctrl: Introduce mbm_L3_assignments to list assignments in a group fs/resctrl: Auto assign counters on mkdir and clean up on group removal fs/resctrl: Introduce mbm_assign_on_mkdir to enable assignments on mkdir fs/resctrl: Provide interface to update the event configurations fs/resctrl: Add event configuration directory under info/L3_MON/ fs/resctrl: Support counter read/reset with mbm_event assignment mode x86/resctrl: Implement resctrl_arch_reset_cntr() and resctrl_arch_cntr_read() x86/resctrl: Refactor resctrl_arch_rmid_read() fs/resctrl: Introduce counter ID read, reset calls in mbm_event mode fs/resctrl: Pass struct rdtgroup instead of individual members fs/resctrl: Add the functionality to unassign MBM events fs/resctrl: Add the functionality to assign MBM events x86,fs/resctrl: Implement resctrl_arch_config_cntr() to assign a counter with ABMC fs/resctrl: Introduce event configuration field in struct mon_evt ... |
||
|
Linus Torvalds
|
bd91417a96 |
- Add infrastructure to be able to debug the microcode loader in a guest
- Refresh Intel old microcode revisions -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmjWZagACgkQEsHwGGHe VUp6IRAAo2g06L8UduzPiUcD46ZV218Z3O8ydrrm4FlJBvq/sm0SBx0u6MES9I84 RrXSKfPbR8ds/ony44dX/o6/ztckAnTw6Mh7/Np43syjsF+9aRNcdeQ0CevD5f1a JdTdfcEtL1FikFPo250GfUTE8HsuqYxkRIW6VYnHaA3FO7SFJ2StyewKYfS7IYfg JN5JM4It9JEQZ0vwZM9GJjvycypDXLFJ0rYoY0Zqkumlx0w8Q1mzafbPuL3129L9 7RO5uJ5aEZPAzVgnpzG5gd/T+xMovfZwkpw7wYDmB+ftML7C4Hvq4BRkT6As9OAD j39RfPyXJsMmF5TEUBrwQ8vGNVrwvALl+dLZZMb4CEz9OryeYNJHP0GzFZnivYvi i0pPUzUNHe7Ex8a4m7XZjDRYSl+RSm13EowuM5uMViRwzTbmT+Rya0EsoybsNXOo vQnXRS74cwr5DVI+A6hnE9r0hR0c+TaHbDAAKJQkja6WXFi7Gr18VZyOASrl0w29 bQ6SDtY9UeV1oNVcnGNRo1DREoWURGbG54M7YIOqhbQNIE4ezgxfrXijGSHYIHED sotvcAeb8NPIqjbPsjZ5kD3aNzl3PkW13d2zjikxht0wCyKui390qUcm3qCAmBug s25imHvGLu4sXWqztoNLeq3o4dp9CtKXaHgni9WlQyBHIpIhH54= =mxlm -----END PGP SIGNATURE----- Merge tag 'x86_microcode_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 microcode loading updates from Borislav Petkov: - Add infrastructure to be able to debug the microcode loader in a guest - Refresh Intel old microcode revisions * tag 'x86_microcode_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode: Add microcode loader debugging functionality x86/microcode: Add microcode= cmdline parsing x86/microcode/intel: Refresh the revisions that determine old_microcode |
||
Paolo Bonzini
|
10ef74c06b |
KVM SEV-SNP CipherText Hiding support for 6.18
Add support for SEV-SNP's CipherText Hiding, an opt-in feature that prevents unauthorized CPU accesses from reading the ciphertext of SNP guest private memory, e.g. to attempt an offline attack. Instead of ciphertext, the CPU will always read back all FFs when CipherText Hiding is enabled. Add new module parameter to the KVM module to enable CipherText Hiding and control the number of ASIDs that can be used for VMs with CipherText Hiding, which is in effect the number of SNP VMs. When CipherText Hiding is enabled, the hared SEV-ES/SEV-SNP ASID space is split into separate ranges for SEV-ES and SEV-SNP guests, i.e. ASIDs that can be used for CipherText Hiding cannot be used to run SEV-ES guests. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEKTobbabEP7vbhhN9OlYIJqCjN/0FAmjXG0EACgkQOlYIJqCj N/1TKQ//UlPcGwoR9cl9V5YRz0b+wNOHNh7JqOTdQsEa00qqIXaAnK+M77Jynvmj YqnQbFCxnQS2pQWkSKv3eJ9Kc9ndTBA7+lL3rrHot6ccks3xM0cHe8Bquu8Of/Ht 1qla1OazrYjJBjFdYCzO+ZQdUvSNAr5RkOPO1KrnHZPELPOQt0+LbxlewRRbKHIj hea8KgmRqmlRJYDJlOGh+G/FFDCFqaeXyOfEkeBuYyCAL60r+0IMHKMwrwlDx/1+ Kzlrf65YuMZlgg7AjhA2mXj4DvlSQkPnMkmkNmNgPXI1XNgHDS/7M1f2m/QbgGV8 Y1D1/GY5u5YD30zDHCmmqPocs5sxrsVoAH8cHalMQsiDlr/HfoKlQ+w0aHEQnHFJ j4GnfCIkyx77tPHeS8e8RJk8qXs+0Bf2bzOAQkv0f/k6JaWhiLzISTFOTyztaf8v m7gPWJORWGZyWVBk+Ad+KGh5Ww2o+sY3aufp81JBT12kC17G0xsHrO1XvUV6YDQ7 wSINQap0TQFY2Lh9Vr1GDNx4jk+YnQOjqKbqd6efyv8No4+j75eaCkbAItma9YVc EPGYa+LaRoC58f7LIChT0uXTAkK7lgdAuGwice7CPsRTjPJqxneIL7u6ohO9jAkz EysFgzsozLynnVUPmXqf5SDots1G5RrAne8Bj+6tLaGxCjW+lLI= =mc41 -----END PGP SIGNATURE----- Merge tag 'kvm-x86-ciphertext-6.18' of https://github.com/kvm-x86/linux into HEAD KVM SEV-SNP CipherText Hiding support for 6.18 Add support for SEV-SNP's CipherText Hiding, an opt-in feature that prevents unauthorized CPU accesses from reading the ciphertext of SNP guest private memory, e.g. to attempt an offline attack. Instead of ciphertext, the CPU will always read back all FFs when CipherText Hiding is enabled. Add new module parameter to the KVM module to enable CipherText Hiding and control the number of ASIDs that can be used for VMs with CipherText Hiding, which is in effect the number of SNP VMs. When CipherText Hiding is enabled, the shared SEV-ES/SEV-SNP ASID space is split into separate ranges for SEV-ES and SEV-SNP guests, i.e. ASIDs that can be used for CipherText Hiding cannot be used to run SEV-ES guests. |
||
|
Linus Torvalds
|
feafee2845 |
arm64 updates for 6.18
Confidential computing:
- Add support for accepting secrets from firmware (e.g. ACPI CCEL)
and mapping them with appropriate attributes.
CPU features:
- Advertise atomic floating-point instructions to userspace.
- Extend Spectre workarounds to cover additional Arm CPU variants.
- Extend list of CPUs that support break-before-make level 2 and
guarantee not to generate TLB conflict aborts for changes of mapping
granularity (BBML2_NOABORT).
- Add GCS support to our uprobes implementation.
Documentation:
- Remove bogus SME documentation concerning register state when
entering/exiting streaming mode.
Entry code:
- Switch over to the generic IRQ entry code (GENERIC_IRQ_ENTRY).
- Micro-optimise syscall entry path with a compiler branch hint.
Memory management:
- Enable huge mappings in vmalloc space even when kernel page-table
dumping is enabled.
- Tidy up the types used in our early MMU setup code.
- Rework rodata= for closer parity with the behaviour on x86.
- For CPUs implementing BBML2_NOABORT, utilise block mappings in the
linear map even when rodata= applies to virtual aliases.
- Don't re-allocate the virtual region between '_text' and '_stext',
as doing so confused tools parsing /proc/vmcore.
Miscellaneous:
- Clean-up Kconfig menuconfig text for architecture features.
- Avoid redundant bitmap_empty() during determination of supported
SME vector lengths.
- Re-enable warnings when building the 32-bit vDSO object.
- Avoid breaking our eggs at the wrong end.
Perf and PMUs:
- Support for v3 of the Hisilicon L3C PMU.
- Support for Hisilicon's MN and NoC PMUs.
- Support for Fujitsu's Uncore PMU.
- Support for SPE's extended event filtering feature.
- Preparatory work to enable data source filtering in SPE.
- Support for multiple lanes in the DWC PCIe PMU.
- Support for i.MX94 in the IMX DDR PMU driver.
- MAINTAINERS update (Thank you, Yicong).
- Minor driver fixes (PERF_IDX2OFF() overflow, CMN register offsets).
Selftests:
- Add basic LSFE check to the existing hwcaps test.
- Support nolibc in GCS tests.
- Extend SVE ptrace test to pass unsupported regsets and invalid vector
lengths.
- Minor cleanups (typos, cosmetic changes).
System registers:
- Fix ID_PFR1_EL1 definition.
- Fix incorrect signedness of some fields in ID_AA64MMFR4_EL1.
- Sync TCR_EL1 definition with the latest Arm ARM (L.b).
- Be stricter about the input fed into our AWK sysreg generator script.
- Typo fixes and removal of redundant definitions.
ACPI, EFI and PSCI:
- Decouple Arm's "Software Delegated Exception Interface" (SDEI)
support from the ACPI GHES code so that it can be used by platforms
booted with device-tree.
- Remove unnecessary per-CPU tracking of the FPSIMD state across EFI
runtime calls.
- Fix a node refcount imbalance in the PSCI device-tree code.
CPU Features:
- Ensure register sanitisation is applied to fields in ID_AA64MMFR4.
- Expose AIDR_EL1 to userspace via sysfs, primarily so that KVM guests
can reliably query the underlying CPU types from the VMM.
- Re-enabling of SME support (CONFIG_ARM64_SME) as a result of fixes
to our context-switching, signal handling and ptrace code.
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon:
"There's good stuff across the board, including some nice mm
improvements for CPUs with the 'noabort' BBML2 feature and a clever
patch to allow ptdump to play nicely with block mappings in the
vmalloc area.
Confidential computing:
- Add support for accepting secrets from firmware (e.g. ACPI CCEL)
and mapping them with appropriate attributes.
CPU features:
- Advertise atomic floating-point instructions to userspace
- Extend Spectre workarounds to cover additional Arm CPU variants
- Extend list of CPUs that support break-before-make level 2 and
guarantee not to generate TLB conflict aborts for changes of
mapping granularity (BBML2_NOABORT)
- Add GCS support to our uprobes implementation.
Documentation:
- Remove bogus SME documentation concerning register state when
entering/exiting streaming mode.
Entry code:
- Switch over to the generic IRQ entry code (GENERIC_IRQ_ENTRY)
- Micro-optimise syscall entry path with a compiler branch hint.
Memory management:
- Enable huge mappings in vmalloc space even when kernel page-table
dumping is enabled
- Tidy up the types used in our early MMU setup code
- Rework rodata= for closer parity with the behaviour on x86
- For CPUs implementing BBML2_NOABORT, utilise block mappings in the
linear map even when rodata= applies to virtual aliases
- Don't re-allocate the virtual region between '_text' and '_stext',
as doing so confused tools parsing /proc/vmcore.
Miscellaneous:
- Clean-up Kconfig menuconfig text for architecture features
- Avoid redundant bitmap_empty() during determination of supported
SME vector lengths
- Re-enable warnings when building the 32-bit vDSO object
- Avoid breaking our eggs at the wrong end.
Perf and PMUs:
- Support for v3 of the Hisilicon L3C PMU
- Support for Hisilicon's MN and NoC PMUs
- Support for Fujitsu's Uncore PMU
- Support for SPE's extended event filtering feature
- Preparatory work to enable data source filtering in SPE
- Support for multiple lanes in the DWC PCIe PMU
- Support for i.MX94 in the IMX DDR PMU driver
- MAINTAINERS update (Thank you, Yicong)
- Minor driver fixes (PERF_IDX2OFF() overflow, CMN register offsets).
Selftests:
- Add basic LSFE check to the existing hwcaps test
- Support nolibc in GCS tests
- Extend SVE ptrace test to pass unsupported regsets and invalid
vector lengths
- Minor cleanups (typos, cosmetic changes).
System registers:
- Fix ID_PFR1_EL1 definition
- Fix incorrect signedness of some fields in ID_AA64MMFR4_EL1
- Sync TCR_EL1 definition with the latest Arm ARM (L.b)
- Be stricter about the input fed into our AWK sysreg generator
script
- Typo fixes and removal of redundant definitions.
ACPI, EFI and PSCI:
- Decouple Arm's "Software Delegated Exception Interface" (SDEI)
support from the ACPI GHES code so that it can be used by platforms
booted with device-tree
- Remove unnecessary per-CPU tracking of the FPSIMD state across EFI
runtime calls
- Fix a node refcount imbalance in the PSCI device-tree code.
CPU Features:
- Ensure register sanitisation is applied to fields in ID_AA64MMFR4
- Expose AIDR_EL1 to userspace via sysfs, primarily so that KVM
guests can reliably query the underlying CPU types from the VMM
- Re-enabling of SME support (CONFIG_ARM64_SME) as a result of fixes
to our context-switching, signal handling and ptrace code"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (93 commits)
arm64: cpufeature: Remove duplicate asm/mmu.h header
arm64: Kconfig: Make CPU_BIG_ENDIAN depend on BROKEN
perf/dwc_pcie: Fix use of uninitialized variable
arm/syscalls: mark syscall invocation as likely in invoke_syscall
Documentation: hisi-pmu: Add introduction to HiSilicon V3 PMU
Documentation: hisi-pmu: Fix of minor format error
drivers/perf: hisi: Add support for L3C PMU v3
drivers/perf: hisi: Refactor the event configuration of L3C PMU
drivers/perf: hisi: Extend the field of tt_core
drivers/perf: hisi: Extract the event filter check of L3C PMU
drivers/perf: hisi: Simplify the probe process of each L3C PMU version
drivers/perf: hisi: Export hisi_uncore_pmu_isr()
drivers/perf: hisi: Relax the event ID check in the framework
perf: Fujitsu: Add the Uncore PMU driver
arm64: map [_text, _stext) virtual address range non-executable+read-only
arm64/sysreg: Update TCR_EL1 register
arm64: Enable vmalloc-huge with ptdump
arm64: cpufeature: add Neoverse-V3AE to BBML2 allow list
arm64: errata: Apply workarounds for Neoverse-V3AE
arm64: cputype: Add Neoverse-V3AE definitions
...
|
||
|
Linus Torvalds
|
b7ce6fa90f |
vfs-6.18-rc1.misc
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Merge tag 'vfs-6.18-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull misc vfs updates from Christian Brauner:
"This contains the usual selections of misc updates for this cycle.
Features:
- Add "initramfs_options" parameter to set initramfs mount options.
This allows to add specific mount options to the rootfs to e.g.,
limit the memory size
- Add RWF_NOSIGNAL flag for pwritev2()
Add RWF_NOSIGNAL flag for pwritev2. This flag prevents the SIGPIPE
signal from being raised when writing on disconnected pipes or
sockets. The flag is handled directly by the pipe filesystem and
converted to the existing MSG_NOSIGNAL flag for sockets
- Allow to pass pid namespace as procfs mount option
Ever since the introduction of pid namespaces, procfs has had very
implicit behaviour surrounding them (the pidns used by a procfs
mount is auto-selected based on the mounting process's active
pidns, and the pidns itself is basically hidden once the mount has
been constructed)
This implicit behaviour has historically meant that userspace was
required to do some special dances in order to configure the pidns
of a procfs mount as desired. Examples include:
* In order to bypass the mnt_too_revealing() check, Kubernetes
creates a procfs mount from an empty pidns so that user
namespaced containers can be nested (without this, the nested
containers would fail to mount procfs)
But this requires forking off a helper process because you cannot
just one-shot this using mount(2)
* Container runtimes in general need to fork into a container
before configuring its mounts, which can lead to security issues
in the case of shared-pidns containers (a privileged process in
the pidns can interact with your container runtime process)
While SUID_DUMP_DISABLE and user namespaces make this less of an
issue, the strict need for this due to a minor uAPI wart is kind
of unfortunate
Things would be much easier if there was a way for userspace to
just specify the pidns they want. So this pull request contains
changes to implement a new "pidns" argument which can be set
using fsconfig(2):
fsconfig(procfd, FSCONFIG_SET_FD, "pidns", NULL, nsfd);
fsconfig(procfd, FSCONFIG_SET_STRING, "pidns", "/proc/self/ns/pid", 0);
or classic mount(2) / mount(8):
// mount -t proc -o pidns=/proc/self/ns/pid proc /tmp/proc
mount("proc", "/tmp/proc", "proc", MS_..., "pidns=/proc/self/ns/pid");
Cleanups:
- Remove the last references to EXPORT_OP_ASYNC_LOCK
- Make file_remove_privs_flags() static
- Remove redundant __GFP_NOWARN when GFP_NOWAIT is used
- Use try_cmpxchg() in start_dir_add()
- Use try_cmpxchg() in sb_init_done_wq()
- Replace offsetof() with struct_size() in ioctl_file_dedupe_range()
- Remove vfs_ioctl() export
- Replace rwlock() with spinlock in epoll code as rwlock causes
priority inversion on preempt rt kernels
- Make ns_entries in fs/proc/namespaces const
- Use a switch() statement() in init_special_inode() just like we do
in may_open()
- Use struct_size() in dir_add() in the initramfs code
- Use str_plural() in rd_load_image()
- Replace strcpy() with strscpy() in find_link()
- Rename generic_delete_inode() to inode_just_drop() and
generic_drop_inode() to inode_generic_drop()
- Remove unused arguments from fcntl_{g,s}et_rw_hint()
Fixes:
- Document @name parameter for name_contains_dotdot() helper
- Fix spelling mistake
- Always return zero from replace_fd() instead of the file descriptor
number
- Limit the size for copy_file_range() in compat mode to prevent a
signed overflow
- Fix debugfs mount options not being applied
- Verify the inode mode when loading it from disk in minixfs
- Verify the inode mode when loading it from disk in cramfs
- Don't trigger automounts with RESOLVE_NO_XDEV
If openat2() was called with RESOLVE_NO_XDEV it didn't traverse
through automounts, but could still trigger them
- Add FL_RECLAIM flag to show_fl_flags() macro so it appears in
tracepoints
- Fix unused variable warning in rd_load_image() on s390
- Make INITRAMFS_PRESERVE_MTIME depend on BLK_DEV_INITRD
- Use ns_capable_noaudit() when determining net sysctl permissions
- Don't call path_put() under namespace semaphore in listmount() and
statmount()"
* tag 'vfs-6.18-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (38 commits)
fcntl: trim arguments
listmount: don't call path_put() under namespace semaphore
statmount: don't call path_put() under namespace semaphore
pid: use ns_capable_noaudit() when determining net sysctl permissions
fs: rename generic_delete_inode() and generic_drop_inode()
init: INITRAMFS_PRESERVE_MTIME should depend on BLK_DEV_INITRD
initramfs: Replace strcpy() with strscpy() in find_link()
initrd: Use str_plural() in rd_load_image()
initramfs: Use struct_size() helper to improve dir_add()
initrd: Fix unused variable warning in rd_load_image() on s390
fs: use the switch statement in init_special_inode()
fs/proc/namespaces: make ns_entries const
filelock: add FL_RECLAIM to show_fl_flags() macro
eventpoll: Replace rwlock with spinlock
selftests/proc: add tests for new pidns APIs
procfs: add "pidns" mount option
pidns: move is-ancestor logic to helper
openat2: don't trigger automounts with RESOLVE_NO_XDEV
namei: move cross-device check to __traverse_mounts
namei: remove LOOKUP_NO_XDEV check from handle_mounts
...
|
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Huang Shijie
|
c0f303d7d4 |
arm64: mm: Rework the 'rodata=' options
As per admin guide documentation, "rodata=on" should be the default on
platforms. Documentation/admin-guide/kernel-parameters.txt describes
these options as
rodata= [KNL,EARLY]
on Mark read-only kernel memory as read-only (default).
off Leave read-only kernel memory writable for debugging.
full Mark read-only kernel memory and aliases as read-only
[arm64]
But on arm64 platform, RODATA_FULL_DEFAULT_ENABLED is enabled by default,
so "rodata=full" is the default instead.
For parity with other architectures, namely x86, rework 'rodata=on' to
match the current "full" behaviour and replace 'rodata=full' with a new
'rodata=noalias' option which retains writable aliases in the direct map
for memory regions outside of the kernel image.
Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
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Ashish Kalra
|
6c7c620585 |
KVM: SEV: Add SEV-SNP CipherTextHiding support
Ciphertext hiding prevents host accesses from reading the ciphertext of SNP guest private memory. Instead of reading ciphertext, the host reads will see constant default values (0xff). The SEV ASID space is split into SEV and SEV-ES/SEV-SNP ASID ranges. Enabling ciphertext hiding further splits the SEV-ES/SEV-SNP ASID space into separate ASID ranges for SEV-ES and SEV-SNP guests. Add a new off-by-default kvm-amd module parameter to enable ciphertext hiding and allow the admin to configure the SEV-ES and SEV-SNP ASID ranges. Simply cap the maximum SEV-SNP ASID as appropriate, i.e. don't reject loading KVM or disable ciphertest hiding for a too-big value, as KVM's general approach for module params is to sanitize inputs based on hardware/kernel support, not burn the world down. This also allows the admin to use -1u to assign all SEV-ES/SNP ASIDs to SNP without needing dedicated handling in KVM. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/95abc49edfde36d4fb791570ea2a4be6ad95fd0d.1755721927.git.ashish.kalra@amd.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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Babu Moger
|
bebf57bf05 |
x86/resctrl: Add ABMC feature in the command line options
Add a kernel command-line parameter to enable or disable the exposure of the ABMC (Assignable Bandwidth Monitoring Counters) hardware feature to resctrl. Signed-off-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com |
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Feng Tang
|
8c2b91fbb0 |
panic: refine the document for 'panic_print'
User reported current document about SYS_INFO_PANIC_CONSOLE_REPLAY is confusing, that people could expect all user space console messages to be replayed. Specify that only 'kernel' messages will be replayed to solve the confusion. Link: https://lkml.kernel.org/r/20250825025701.81921-3-feng.tang@linux.alibaba.com Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com> Reported-by: Askar Safin <safinaskar@zohomail.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: John Ogness <john.ogness@linutronix.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lance Yang <lance.yang@linux.dev> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Kees Cook
|
026211c40b |
x86/cfi: Add "debug" option to "cfi=" bootparam
Add "debug" option for "cfi=" bootparam to get details on early CFI initialization steps so future Kees can find breakage easier. Signed-off-by: Kees Cook <kees@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20250904034656.3670313-5-kees@kernel.org |
||
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Kees Cook
|
24452d9ef1 |
x86/cfi: Document the "cfi=" bootparam options
The kernel-parameters.txt didn't have a section for the cfi= options. Add it. Signed-off-by: Kees Cook <kees@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20250904034656.3670313-3-kees@kernel.org |
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Borislav Petkov (AMD)
|
43181a4726 |
x86/microcode: Add microcode loader debugging functionality
Instead of adding ad-hoc debugging glue to the microcode loader each time I need it, add debugging functionality which is not built by default. Simulate all patch handling the loader does except the actual loading of the microcode patch into the hardware. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/20250820135043.19048-3-bp@kernel.org |
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Borislav Petkov (AMD)
|
632ff61706 |
x86/microcode: Add microcode= cmdline parsing
Add a "microcode=" command line argument after which all options can be passed in a comma-separated list. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Sohil Mehta <sohil.mehta@intel.com> Reviewed-by: Chang S. Bae <chang.seok.bae@intel.com> Link: https://lore.kernel.org/20250820135043.19048-2-bp@kernel.org |
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Wladislav Wiebe
|
673f1244b3 |
genirq: Add support for warning on long-running interrupt handlers
Introduce a mechanism to detect and warn about prolonged interrupt handlers. With a new command-line parameter (irqhandler.duration_warn_us=), users can configure the duration threshold in microseconds when a warning in such format should be emitted: "[CPU14] long duration of IRQ[159:bad_irq_handler [long_irq]], took: 1330 us" The implementation uses local_clock() to measure the execution duration of the generic IRQ per-CPU event handler. Signed-off-by: Wladislav Wiebe <wladislav.wiebe@nokia.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/all/20250804093525.851-1-wladislav.wiebe@nokia.com |
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Lichen Liu
|
278033a225 |
fs: Add 'initramfs_options' to set initramfs mount options
When CONFIG_TMPFS is enabled, the initial root filesystem is a tmpfs. By default, a tmpfs mount is limited to using 50% of the available RAM for its content. This can be problematic in memory-constrained environments, particularly during a kdump capture. In a kdump scenario, the capture kernel boots with a limited amount of memory specified by the 'crashkernel' parameter. If the initramfs is large, it may fail to unpack into the tmpfs rootfs due to insufficient space. This is because to get X MB of usable space in tmpfs, 2*X MB of memory must be available for the mount. This leads to an OOM failure during the early boot process, preventing a successful crash dump. This patch introduces a new kernel command-line parameter, initramfs_options, which allows passing specific mount options directly to the rootfs when it is first mounted. This gives users control over the rootfs behavior. For example, a user can now specify initramfs_options=size=75% to allow the tmpfs to use up to 75% of the available memory. This can significantly reduce the memory pressure for kdump. Consider a practical example: To unpack a 48MB initramfs, the tmpfs needs 48MB of usable space. With the default 50% limit, this requires a memory pool of 96MB to be available for the tmpfs mount. The total memory requirement is therefore approximately: 16MB (vmlinuz) + 48MB (loaded initramfs) + 48MB (unpacked kernel) + 96MB (for tmpfs) + 12MB (runtime overhead) ≈ 220MB. By using initramfs_options=size=75%, the memory pool required for the 48MB tmpfs is reduced to 48MB / 0.75 = 64MB. This reduces the total memory requirement by 32MB (96MB - 64MB), allowing the kdump to succeed with a smaller crashkernel size, such as 192MB. An alternative approach of reusing the existing rootflags parameter was considered. However, a new, dedicated initramfs_options parameter was chosen to avoid altering the current behavior of rootflags (which applies to the final root filesystem) and to prevent any potential regressions. Also add documentation for the new kernel parameter "initramfs_options" This approach is inspired by prior discussions and patches on the topic. Ref: https://www.lightofdawn.org/blog/?viewDetailed=00128 Ref: https://landley.net/notes-2015.html#01-01-2015 Ref: https://lkml.org/lkml/2021/6/29/783 Ref: https://www.kernel.org/doc/html/latest/filesystems/ramfs-rootfs-initramfs.html#what-is-rootfs Signed-off-by: Lichen Liu <lichliu@redhat.com> Link: https://lore.kernel.org/20250815121459.3391223-1-lichliu@redhat.com Tested-by: Rob Landley <rob@landley.net> Signed-off-by: Christian Brauner <brauner@kernel.org> |
||
Bjorn Helgaas
|
c349216707 |
Documentation: Fix admin-guide typos
Fix typos. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250813200526.290420-4-helgaas@kernel.org |
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Pawan Gupta
|
556c1ad666 |
x86/vmscape: Enable the mitigation
Enable the previously added mitigation for VMscape. Add the cmdline
vmscape={off|ibpb|force} and sysfs reporting.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
|
||
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Linus Torvalds
|
35a813e010 |
printk changes for 6.17
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|
Linus Torvalds
|
e991acf1bc |
Significant patch series in this pull request:
- The 2 patch series "squashfs: Remove page->mapping references" from
Matthew Wilcox gets us closer to being able to remove page->mapping.
- The 5 patch series "relayfs: misc changes" from Jason Xing does some
maintenance and minor feature addition work in relayfs.
- The 5 patch series "kdump: crashkernel reservation from CMA" from Jiri
Bohac switches us from static preallocation of the kdump crashkernel's
working memory over to dynamic allocation. So the difficulty of
a-priori estimation of the second kernel's needs is removed and the
first kernel obtains extra memory.
- The 5 patch series "generalize panic_print's dump function to be used
by other kernel parts" from Feng Tang implements some consolidation and
rationalizatio of the various ways in which a faiing kernel splats
information at the operator.
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Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
"Significant patch series in this pull request:
- "squashfs: Remove page->mapping references" (Matthew Wilcox) gets
us closer to being able to remove page->mapping
- "relayfs: misc changes" (Jason Xing) does some maintenance and
minor feature addition work in relayfs
- "kdump: crashkernel reservation from CMA" (Jiri Bohac) switches
us from static preallocation of the kdump crashkernel's working
memory over to dynamic allocation. So the difficulty of a-priori
estimation of the second kernel's needs is removed and the first
kernel obtains extra memory
- "generalize panic_print's dump function to be used by other
kernel parts" (Feng Tang) implements some consolidation and
rationalization of the various ways in which a failing kernel
splats information at the operator
* tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (80 commits)
tools/getdelays: add backward compatibility for taskstats version
kho: add test for kexec handover
delaytop: enhance error logging and add PSI feature description
samples: Kconfig: fix spelling mistake "instancess" -> "instances"
fat: fix too many log in fat_chain_add()
scripts/spelling.txt: add notifer||notifier to spelling.txt
xen/xenbus: fix typo "notifer"
net: mvneta: fix typo "notifer"
drm/xe: fix typo "notifer"
cxl: mce: fix typo "notifer"
KVM: x86: fix typo "notifer"
MAINTAINERS: add maintainers for delaytop
ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()
ucount: fix atomic_long_inc_below() argument type
kexec: enable CMA based contiguous allocation
stackdepot: make max number of pools boot-time configurable
lib/xxhash: remove unused functions
init/Kconfig: restore CONFIG_BROKEN help text
lib/raid6: update recov_rvv.c zero page usage
docs: update docs after introducing delaytop
...
|
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Matt Fleming
|
ed4f142f72 |
stackdepot: make max number of pools boot-time configurable
We're hitting the WARN in depot_init_pool() about reaching the stack depot limit because we have long stacks that don't dedup very well. Introduce a new start-up parameter to allow users to set the number of maximum stack depot pools. Link: https://lkml.kernel.org/r/20250718153928.94229-1-matt@readmodwrite.com Signed-off-by: Matt Fleming <mfleming@cloudflare.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linus Torvalds
|
6aee5aed2e |
cgroup: Changes for v6.17
- Allow css_rstat_updated() in NMI context to enable memory accounting for allocations in NMI context. - /proc/cgroups doesn't contain useful information for cgroup2 and was updated to only show v1 controllers. This unfortunately broke something in the wild. Add an option to bring back the old behavior to ease transition. - selftest updates and other cleanups. -----BEGIN PGP SIGNATURE----- iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCaIqlxQ4cdGpAa2VybmVs Lm9yZwAKCRCxYfJx3gVYGcTMAQDUlGf50ATWB9hDU7zUG4lVn8s8n8/+x8QFGHn4 e4NERQD9FpU/jLN+cwGgspKo+L9qpu/1g+t36cJLcOuEKKoaQwI= =FLwx -----END PGP SIGNATURE----- Merge tag 'cgroup-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup Pull cgroup updates from Tejun Heo: - Allow css_rstat_updated() in NMI context to enable memory accounting for allocations in NMI context. - /proc/cgroups doesn't contain useful information for cgroup2 and was updated to only show v1 controllers. This unfortunately broke something in the wild. Add an option to bring back the old behavior to ease transition. - selftest updates and other cleanups. * tag 'cgroup-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: Add compatibility option for content of /proc/cgroups selftests/cgroup: fix cpu.max tests cgroup: llist: avoid memory tears for llist_node selftests: cgroup: Fix missing newline in test_zswap_writeback_one selftests: cgroup: Allow longer timeout for kmem_dead_cgroups cleanup memcg: cgroup: call css_rstat_updated irrespective of in_nmi() cgroup: remove per-cpu per-subsystem locks cgroup: make css_rstat_updated nmi safe cgroup: support to enable nmi-safe css_rstat_updated selftests: cgroup: Fix compilation on pre-cgroupns kernels selftests: cgroup: Optionally set up v1 environment selftests: cgroup: Add support for named v1 hierarchies in test_core selftests: cgroup_util: Add helpers for testing named v1 hierarchies Documentation: cgroup: add section explaining controller availability cgroup: Drop sock_cgroup_classid() dummy implementation |
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Linus Torvalds
|
02523d2d93 |
integrity-v6.17
-----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQQdXVVFGN5XqKr1Hj7LwZzRsCrn5QUCaItL7xQcem9oYXJAbGlu dXguaWJtLmNvbQAKCRDLwZzRsCrn5TduAQDu7W14clgQiJNwYo2hN5cEnfKZVkRI 6PJGyxV+g+cMOQEA4Aepo2EL86kQJH33iAUmzi0bvyQl4cPTuKqpw5CgjQg= =eGra -----END PGP SIGNATURE----- Merge tag 'integrity-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity Pull integrity update from Mimi Zohar: "A single commit to permit disabling IMA from the boot command line for just the kdump kernel. The exception itself sort of makes sense. My concern is that exceptions do not remain as exceptions, but somehow morph to become the norm" * tag 'integrity-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity: ima: add a knob ima= to allow disabling IMA in kdump kernel |
||
|
Linus Torvalds
|
e8d780dcd9 |
slab updates for 6.17
-----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEe7vIQRWZI0iWSE3xu+CwddJFiJoFAmiHj+8ACgkQu+CwddJF iJrnOggAjBwzwvJsUWB3YBaF0wyLipLcdNsbbDOqvLYShQifaEuwN/i8FYO+D7a3 DyBR3NK4pWcZtxrSJVHcAuy06yQq5sqeU9Dc5iJ+ADCXnqYshUFp5ARtNVaputGy b4990JMIG0YxEBD3Gx01kicCdae9JkU5FGZKFk65oHalaGQk7GtMfG+e/obh4z9D e9R5Ub+9zM9Efwl/DD7qkETWKAq0gBjvbj0dYO0E7ctO/WNr93Z1FsnbxiUcPiG3 ED1LwTuNYYccBf/8iPGy/cp0WcWTwGtjbPEUk3lyY0KcrpgGT+cyvJj8G0GfnvV4 V/OLZrzwVZw2k3MopbFl/RdgWGf0bA== =gZB5 -----END PGP SIGNATURE----- Merge tag 'slab-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab Pull slab updates from Vlastimil Babka: - Convert struct slab to its own flags instead of referencing page flags, which is another preparation step before separating it from struct page completely. Along with that, a bunch of documentation fixes and cleanups (Matthew Wilcox) - Convert large kmalloc to use frozen pages in order to be consistent with non-large kmalloc slabs (Vlastimil Babka) - MAINTAINERS updates (Matthew Wilcox, Lorenzo Stoakes) - Restore NUMA policy support for large kmalloc, broken by mistake in v6.1 (Vlastimil Babka) * tag 'slab-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: MAINTAINERS: add missing files to slab section slab: Update MAINTAINERS entry memcg_slabinfo: Fix use of PG_slab kfence: Remove mention of PG_slab vmcoreinfo: Remove documentation of PG_slab and PG_hugetlb doc: Add slab internal kernel-doc slub: Fix a documentation build error for krealloc() slab: Add SL_pfmemalloc flag slab: Add SL_partial flag slab: Rename slab->__page_flags to slab->flags doc: Move SLUB documentation to the admin guide mm, slab: use frozen pages for large kmalloc mm, slab: restore NUMA policy support for large kmalloc |
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|
Linus Torvalds
|
2db4df0c09 |
RCU pull request for v6.17
This pull request contains the following branches:
rcu-exp.23.07.2025
- Protect against early RCU exp quiescent state reporting during exp
grace period initialization.
- Remove superfluous barrier in task unblock path.
- Remove the CPU online quiescent state report optimization, which is
error prone for certain scenarios.
- Add warning for unexpected pending requested expedited quiescent
state on dying CPU.
rcu.22.07.2025
- Robustify rcu_is_cpu_rrupt_from_idle() by using more accurate
indicators of the actual context tracking state of a CPU.
- Handle ->defer_qs_iw_pending field data race.
- Enable rcu_normal_wake_from_gp by default on systems with <= 16 CPUs.
- Fix lockup in rcu_read_unlock() due to recursive irq_exit() calls.
- Refactor expedited handling condition in rcu_read_unlock_special().
- Documentation updates for hotplug and GP init scan ordering,
separation of rcu_state and rnp's gp_seq states, quiescent state
reporting for offline CPUs.
torture-scripts.16.07.2025
- Cleanup and improve scripts : remove superfluous warnings for disabled
tests; better handling of kvm.sh --kconfig arg; suppress some confusing
diagnostics; tolerate bad kvm.sh args; add new diagnostic for build
output; fail allmodconfig testing on warnings.
- Include RCU_TORTURE_TEST_CHK_RDR_STATE config for KCSAN kernels.
- Disable default RCU-tasks and clocksource-wdog testing on arm64.
- Add EXPERT Kconfig option for arm64 KCSAN runs.
- Remove SRCU-lite testing.
rcutorture.16.07.2025
- Start torture writer threads creation after reader threads to handle
race in SRCU-P scenario.
- Add SRCU down_read()/up_read() test.
- Add diagnostics for delayed SRCU up_read(), unmatched up_read(), print
number of up/down readers and the number of such readers which
migrated to other CPU.
- Ignore certain unsupported configurations for trivial RCU test.
- Fix splats in RT kernels due to inaccurate checks for BH-disabled
context.
- Enable checks and logs to capture intentionally exercised unexpected
scenarios (too short readers) for BUSTED test.
- Remove SRCU-lite testing.
srcu.19.07.2025
- Expedite SRCU-fast grace periods.
- Remove SRCU-lite implementation.
- Add guards for SRCU-fast readers.
rcu.nocb.18.07.2025
- Dump NOCB group leader state on stall detection.
- Robustify nocb_cb_kthread pointer accesses.
- Fix delayed execution of hurry callbacks when LAZY_RCU is enabled.
refscale.07.07.2025
- Fix multiplication overflow in "loops" and "nreaders" calculations.
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Merge tag 'rcu.release.v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux
Pull RCU updates from Neeraj Upadhyay:
"Expedited grace period updates:
- Protect against early RCU exp quiescent state reporting during exp
grace period initialization
- Remove superfluous barrier in task unblock path
- Remove the CPU online quiescent state report optimization, which is
error prone for certain scenarios
- Add warning for unexpected pending requested expedited quiescent
state on dying CPU
Core:
- Robustify rcu_is_cpu_rrupt_from_idle() by using more accurate
indicators of the actual context tracking state of a CPU
- Handle ->defer_qs_iw_pending field data race
- Enable rcu_normal_wake_from_gp by default on systems with <= 16
CPUs
- Fix lockup in rcu_read_unlock() due to recursive irq_exit() calls
- Refactor expedited handling condition in rcu_read_unlock_special()
- Documentation updates for hotplug and GP init scan ordering,
separation of rcu_state and rnp's gp_seq states, quiescent state
reporting for offline CPUs
torture-scripts:
- Cleanup and improve scripts : remove superfluous warnings for
disabled tests; better handling of kvm.sh --kconfig arg; suppress
some confusing diagnostics; tolerate bad kvm.sh args; add new
diagnostic for build output; fail allmodconfig testing on warnings
- Include RCU_TORTURE_TEST_CHK_RDR_STATE config for KCSAN kernels
- Disable default RCU-tasks and clocksource-wdog testing on arm64
- Add EXPERT Kconfig option for arm64 KCSAN runs
- Remove SRCU-lite testing
rcutorture:
- Start torture writer threads creation after reader threads to
handle race in SRCU-P scenario
- Add SRCU down_read()/up_read() test
- Add diagnostics for delayed SRCU up_read(), unmatched up_read(),
print number of up/down readers and the number of such readers
which migrated to other CPU
- Ignore certain unsupported configurations for trivial RCU test
- Fix splats in RT kernels due to inaccurate checks for BH-disabled
context
- Enable checks and logs to capture intentionally exercised
unexpected scenarios (too short readers) for BUSTED test
- Remove SRCU-lite testing
srcu:
- Expedite SRCU-fast grace periods
- Remove SRCU-lite implementation
- Add guards for SRCU-fast readers
rcu nocb:
- Dump NOCB group leader state on stall detection
- Robustify nocb_cb_kthread pointer accesses
- Fix delayed execution of hurry callbacks when LAZY_RCU is enabled
refscale:
- Fix multiplication overflow in "loops" and "nreaders" calculations"
* tag 'rcu.release.v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (49 commits)
rcu: Document concurrent quiescent state reporting for offline CPUs
rcu: Document separation of rcu_state and rnp's gp_seq
rcu: Document GP init vs hotplug-scan ordering requirements
srcu: Add guards for SRCU-fast readers
rcu: Fix delayed execution of hurry callbacks
rcu: Refactor expedited handling check in rcu_read_unlock_special()
checkpatch: Remove SRCU-lite deprecation
srcu: Remove SRCU-lite implementation
srcu: Expedite SRCU-fast grace periods
rcutorture: Remove support for SRCU-lite
rcutorture: Remove SRCU-lite scenarios
torture: Remove support for SRCU-lite
torture: Make torture.sh --allmodconfig testing fail on warnings
torture: Add "ERROR" diagnostic for testing kernel-build output
torture: Make torture.sh tolerate runs having bad kvm.sh arguments
torture: Add textid.txt file to --do-allmodconfig and --do-rcu-rust runs
torture: Extract testid.txt generation to separate script
torture: Suppress "find" diagnostics from torture.sh --do-none run
torture: Provide EXPERT Kconfig option for arm64 KCSAN torture.sh runs
rcu: Fix rcu_read_unlock() deadloop due to IRQ work
...
|
||
|
Linus Torvalds
|
bf76f23aa1 |
Scheduler updates for v6.17:
Core scheduler changes:
- Better tracking of maximum lag of tasks in presence of different
slices duration, for better handling of lag in the fair
scheduler. (Vincent Guittot)
- Clean up and standardize #if/#else/#endif markers throughout
the entire scheduler code base (Ingo Molnar)
- Make SMP unconditional: build the SMP scheduler's
data structures and logic on UP kernel too, even though
they are not used, to simplify the scheduler and remove
around 200 #ifdef/[#else]/#endif blocks from the
scheduler. (Ingo Molnar)
- Reorganize cgroup bandwidth control interface handling
for better interfacing with sched_ext (Tejun Heo)
Balancing:
- Bump sd->max_newidle_lb_cost when newidle balance fails (Chris Mason)
- Remove sched_domain_topology_level::flags to simplify the code (Prateek Nayak)
- Simplify and clean up build_sched_topology() (Li Chen)
- Optimize build_sched_topology() on large machines (Li Chen)
Real-time scheduling:
- Add initial version of proxy execution: a mechanism for mutex-owning
tasks to inherit the scheduling context of higher priority waiters.
Currently limited to a single runqueue and conditional on CONFIG_EXPERT,
and other limitations. (John Stultz, Peter Zijlstra, Valentin Schneider)
- Deadline scheduler (Juri Lelli):
- Fix dl_servers initialization order (Juri Lelli)
- Fix DL scheduler's root domain reinitialization logic (Juri Lelli)
- Fix accounting bugs after global limits change (Juri Lelli)
- Fix scalability regression by implementing less agressive dl_server handling
(Peter Zijlstra)
PSI:
- Improve scalability by optimizing psi_group_change() cpu_clock() usage
(Peter Zijlstra)
Rust changes:
- Make Task, CondVar and PollCondVar methods inline to avoid unnecessary
function calls (Kunwu Chan, Panagiotis Foliadis)
- Add might_sleep() support for Rust code: Rust's "#[track_caller]"
mechanism is used so that Rust's might_sleep() doesn't need to be
defined as a macro (Fujita Tomonori)
- Introduce file_from_location() (Boqun Feng)
Debugging & instrumentation:
- Make clangd usable with scheduler source code files again (Peter Zijlstra)
- tools: Add root_domains_dump.py which dumps root domains info (Juri Lelli)
- tools: Add dl_bw_dump.py for printing bandwidth accounting info (Juri Lelli)
Misc cleanups & fixes:
- Remove play_idle() (Feng Lee)
- Fix check_preemption_disabled() (Sebastian Andrzej Siewior)
- Do not call __put_task_struct() on RT if pi_blocked_on is set
(Luis Claudio R. Goncalves)
- Correct the comment in place_entity() (wang wei)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-core-2025-07-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar:
"Core scheduler changes:
- Better tracking of maximum lag of tasks in presence of different
slices duration, for better handling of lag in the fair scheduler
(Vincent Guittot)
- Clean up and standardize #if/#else/#endif markers throughout the
entire scheduler code base (Ingo Molnar)
- Make SMP unconditional: build the SMP scheduler's data structures
and logic on UP kernel too, even though they are not used, to
simplify the scheduler and remove around 200 #ifdef/[#else]/#endif
blocks from the scheduler (Ingo Molnar)
- Reorganize cgroup bandwidth control interface handling for better
interfacing with sched_ext (Tejun Heo)
Balancing:
- Bump sd->max_newidle_lb_cost when newidle balance fails (Chris
Mason)
- Remove sched_domain_topology_level::flags to simplify the code
(Prateek Nayak)
- Simplify and clean up build_sched_topology() (Li Chen)
- Optimize build_sched_topology() on large machines (Li Chen)
Real-time scheduling:
- Add initial version of proxy execution: a mechanism for
mutex-owning tasks to inherit the scheduling context of higher
priority waiters.
Currently limited to a single runqueue and conditional on
CONFIG_EXPERT, and other limitations (John Stultz, Peter Zijlstra,
Valentin Schneider)
- Deadline scheduler (Juri Lelli):
- Fix dl_servers initialization order (Juri Lelli)
- Fix DL scheduler's root domain reinitialization logic (Juri
Lelli)
- Fix accounting bugs after global limits change (Juri Lelli)
- Fix scalability regression by implementing less agressive
dl_server handling (Peter Zijlstra)
PSI:
- Improve scalability by optimizing psi_group_change() cpu_clock()
usage (Peter Zijlstra)
Rust changes:
- Make Task, CondVar and PollCondVar methods inline to avoid
unnecessary function calls (Kunwu Chan, Panagiotis Foliadis)
- Add might_sleep() support for Rust code: Rust's "#[track_caller]"
mechanism is used so that Rust's might_sleep() doesn't need to be
defined as a macro (Fujita Tomonori)
- Introduce file_from_location() (Boqun Feng)
Debugging & instrumentation:
- Make clangd usable with scheduler source code files again (Peter
Zijlstra)
- tools: Add root_domains_dump.py which dumps root domains info (Juri
Lelli)
- tools: Add dl_bw_dump.py for printing bandwidth accounting info
(Juri Lelli)
Misc cleanups & fixes:
- Remove play_idle() (Feng Lee)
- Fix check_preemption_disabled() (Sebastian Andrzej Siewior)
- Do not call __put_task_struct() on RT if pi_blocked_on is set (Luis
Claudio R. Goncalves)
- Correct the comment in place_entity() (wang wei)"
* tag 'sched-core-2025-07-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (84 commits)
sched/idle: Remove play_idle()
sched: Do not call __put_task_struct() on rt if pi_blocked_on is set
sched: Start blocked_on chain processing in find_proxy_task()
sched: Fix proxy/current (push,pull)ability
sched: Add an initial sketch of the find_proxy_task() function
sched: Fix runtime accounting w/ split exec & sched contexts
sched: Move update_curr_task logic into update_curr_se
locking/mutex: Add p->blocked_on wrappers for correctness checks
locking/mutex: Rework task_struct::blocked_on
sched: Add CONFIG_SCHED_PROXY_EXEC & boot argument to enable/disable
sched/topology: Remove sched_domain_topology_level::flags
x86/smpboot: avoid SMT domain attach/destroy if SMT is not enabled
x86/smpboot: moves x86_topology to static initialize and truncate
x86/smpboot: remove redundant CONFIG_SCHED_SMT
smpboot: introduce SDTL_INIT() helper to tidy sched topology setup
tools/sched: Add dl_bw_dump.py for printing bandwidth accounting info
tools/sched: Add root_domains_dump.py which dumps root domains info
sched/deadline: Fix accounting after global limits change
sched/deadline: Reset extra_bw to max_bw when clearing root domains
sched/deadline: Initialize dl_servers after SMP
...
|