mm: introduce lock_vma_under_rcu to be used from arch-specific code

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Introduce lock_vma_under_rcu function to lookup and lock a VMA during page
fault handling.  When VMA is not found, can't be locked or changes after
being locked, the function returns NULL.  The lookup is performed under
RCU protection to prevent the found VMA from being destroyed before the
VMA lock is acquired.  VMA lock statistics are updated according to the
results.  For now only anonymous VMAs can be searched this way.  In other
cases the function returns NULL.

Link: https://lkml.kernel.org/r/20230227173632.3292573-24-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Suren Baghdasaryan 2023-02-27 09:36:22 -08:00 • committed by Andrew Morton

parent 457f67be59

commit 50ee325372

2 changed files with 49 additions and 0 deletions

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3

include/linux/mm.h

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46

mm/memory.c

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