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linux/arch/powerpc
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Suren Baghdasaryan a55dd240a9 mm: enable page walking API to lock vmas during the walk 
commit 49b0638502 upstream.

walk_page_range() and friends often operate under write-locked mmap_lock.
With introduction of vma locks, the vmas have to be locked as well during
such walks to prevent concurrent page faults in these areas.  Add an
additional member to mm_walk_ops to indicate locking requirements for the
walk.

The change ensures that page walks which prevent concurrent page faults
by write-locking mmap_lock, operate correctly after introduction of
per-vma locks.  With per-vma locks page faults can be handled under vma
lock without taking mmap_lock at all, so write locking mmap_lock would
not stop them.  The change ensures vmas are properly locked during such
walks.

A sample issue this solves is do_mbind() performing queue_pages_range()
to queue pages for migration.  Without this change a concurrent page
can be faulted into the area and be left out of migration.

Link: https://lkml.kernel.org/r/20230804152724.3090321-2-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Suggested-by: Jann Horn <jannh@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michel Lespinasse <michel@lespinasse.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-08-30 14:52:36 +02:00
..
boot powerpc: dts: turris1x.dts: Fix PCIe MEM size for pci2 node 2023-07-19 16:36:46 +02:00
configs powerpc updates for 6.4 2023-04-28 16:24:32 -07:00
crypto powerpc/crypto: Fix aes-gcm-p10 link errors 2023-05-30 15:50:32 +10:00
include word-at-a-time: use the same return type for has_zero regardless of endianness 2023-08-11 12:14:08 +02:00
kernel powerpc/rtas_flash: allow user copy to flash block cache objects 2023-08-23 17:32:37 +02:00
kexec powerpc/kexec_file: print error string on usable memory property update failure 2023-02-15 23:14:06 +11:00
kvm s390: 2023-05-01 12:06:20 -07:00
lib powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
math-emu powerpc/math-emu: Inhibit W=1 warnings 2022-09-08 11:11:18 +10:00
mm mm: enable page walking API to lock vmas during the walk 2023-08-30 14:52:36 +02:00
net powerpc/bpf: populate extable entries only during the last pass 2023-05-15 15:40:31 +10:00
perf powerpc/perf: Properly detect mpc7450 family 2023-03-30 23:35:43 +11:00
platforms powerpc/pseries/vas: Hold mmap_mutex after mmap lock during window close 2023-08-03 10:25:41 +02:00
purgatory powerpc/purgatory: remove PGO flags 2023-06-12 11:31:50 -07:00
sysdev powerpc updates for 6.4 2023-04-28 16:24:32 -07:00
tools powerpc: Move script to check relocations at compile time in scripts/ 2023-04-19 07:46:31 -07:00
xmon powerpc/xmon: Use KSYM_NAME_LEN in array size 2023-05-30 16:46:56 +10:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig powerpc/mm: Convert to using lock_mm_and_find_vma() 2023-07-01 13:12:39 +02:00
Kconfig.debug powerpc: allow PPC_EARLY_DEBUG_CPM only when SERIAL_CPM=y 2023-07-19 16:36:46 +02:00
Makefile powerpc: Fail build if using recordmcount with binutils v2.37 2023-07-23 13:53:55 +02:00
Makefile.postlink kbuild: remove --include-dir MAKEFLAG from top Makefile 2023-02-05 18:51:22 +09:00