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mm: mark VMA as being written when changing vm_flags

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Updates to vm_flags have to be done with VMA marked as being written for
preventing concurrent page faults or other modifications.

Link: https://lkml.kernel.org/r/20230227173632.3292573-14-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 09:36:12 -08:00 committed by Andrew Morton
parent 5e31275cc9
commit c732293331
1 changed files with 5 additions and 5 deletions
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10
include/linux/mm.h
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@ -727,28 +727,28 @@ static inline void vm_flags_init(struct vm_area_struct *vma,
static inline void vm_flags_reset(struct vm_area_struct *vma,
vm_flags_t flags)
{
mmap_assert_write_locked(vma->vm_mm);
vma_start_write(vma);
vm_flags_init(vma, flags);
}
static inline void vm_flags_reset_once(struct vm_area_struct *vma,
vm_flags_t flags)
{
mmap_assert_write_locked(vma->vm_mm);
vma_start_write(vma);
WRITE_ONCE(ACCESS_PRIVATE(vma, __vm_flags), flags);
}
static inline void vm_flags_set(struct vm_area_struct *vma,
vm_flags_t flags)
{
mmap_assert_write_locked(vma->vm_mm);
vma_start_write(vma);
ACCESS_PRIVATE(vma, __vm_flags) |= flags;
}
static inline void vm_flags_clear(struct vm_area_struct *vma,
vm_flags_t flags)
{
mmap_assert_write_locked(vma->vm_mm);
vma_start_write(vma);
ACCESS_PRIVATE(vma, __vm_flags) &= ~flags;
}
@ -769,7 +769,7 @@ static inline void __vm_flags_mod(struct vm_area_struct *vma,
static inline void vm_flags_mod(struct vm_area_struct *vma,
vm_flags_t set, vm_flags_t clear)
{
mmap_assert_write_locked(vma->vm_mm);
vma_start_write(vma);
__vm_flags_mod(vma, set, clear);
}