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Thomas Gleixner 077e1b7cd5 x86/ioapic: Handle allocation failures gracefully 
[ Upstream commit 830802a0fe ]

Breno observed panics when using failslab under certain conditions during
runtime:

   can not alloc irq_pin_list (-1,0,20)
   Kernel panic - not syncing: IO-APIC: failed to add irq-pin. Can not proceed

   panic+0x4e9/0x590
   mp_irqdomain_alloc+0x9ab/0xa80
   irq_domain_alloc_irqs_locked+0x25d/0x8d0
   __irq_domain_alloc_irqs+0x80/0x110
   mp_map_pin_to_irq+0x645/0x890
   acpi_register_gsi_ioapic+0xe6/0x150
   hpet_open+0x313/0x480

That's a pointless panic which is a leftover of the historic IO/APIC code
which panic'ed during early boot when the interrupt allocation failed.

The only place which might justify panic is the PIT/HPET timer_check() code
which tries to figure out whether the timer interrupt is delivered through
the IO/APIC. But that code does not require to handle interrupt allocation
failures. If the interrupt cannot be allocated then timer delivery fails
and it either panics due to that or falls back to legacy mode.

Cure this by removing the panic wrapper around __add_pin_to_irq_node() and
making mp_irqdomain_alloc() aware of the failure condition and handle it as
any other failure in this function gracefully.

Reported-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Breno Leitao <leitao@debian.org>
Tested-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Link: https://lore.kernel.org/all/ZqfJmUF8sXIyuSHN@gmail.com
Link: https://lore.kernel.org/all/20240802155440.275200843@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-10-10 11:57:28 +02:00
arch
block blk_iocost: fix more out of bound shifts 2024-10-10 11:57:24 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: simd - Do not call crypto_alloc_tfm during registration 2024-10-10 11:57:26 +02:00
Documentation proc: add config & param to block forcing mem writes 2024-10-10 11:57:27 +02:00
drivers nfp: Use IRQF_NO_AUTOEN flag in request_irq() 2024-10-10 11:57:28 +02:00
fs proc: add config & param to block forcing mem writes 2024-10-10 11:57:27 +02:00
include drivers/perf: arm_spe: Use perf_allow_kernel() for permissions 2024-10-10 11:57:27 +02:00
init rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT 2024-08-29 17:33:29 +02:00
io_uring io_uring/sqpoll: do not put cpumask on stack 2024-10-04 16:29:44 +02:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:47:13 +02:00
kernel drivers/perf: arm_spe: Use perf_allow_kernel() for permissions 2024-10-10 11:57:27 +02:00
lib mm/filemap: optimize filemap folio adding 2024-10-04 16:30:02 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/damon/vaddr: protect vma traversal in __damon_va_thre_regions() with rcu read lock 2024-10-04 16:30:03 +02:00
net wifi: mac80211: fix RCU list iterations 2024-10-10 11:57:27 +02:00
rust rust: kbuild: fix export of bss symbols 2024-09-12 11:11:32 +02:00
samples samples/bpf: Fix compilation errors with cf-protection option 2024-10-04 16:29:19 +02:00
scripts scripts: kconfig: merge_config: config files: add a trailing newline 2024-09-18 19:24:05 +02:00
security proc: add config & param to block forcing mem writes 2024-10-10 11:57:27 +02:00
sound ALSA: usb-audio: Add input value sanity checks for standard types 2024-10-10 11:57:28 +02:00
tools selftests: netfilter: Fix nft_audit.sh for newer nft binaries 2024-10-10 11:57:15 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS membarrier: riscv: Add full memory barrier in switch_mm() 2024-09-12 11:11:45 +02:00
Makefile Linux 6.6.54 2024-10-04 16:30:05 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.