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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>
This commit is contained in:
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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@@ -719,6 +719,9 @@ static inline void vma_mark_detached(struct vm_area_struct *vma, bool detached)
vma->detached = detached;
}
struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
unsigned long address);
#else /* CONFIG_PER_VMA_LOCK */
static inline void vma_init_lock(struct vm_area_struct *vma) {}