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mm/mmap: leverage vma_rb_erase_ignore() to implement vma_rb_erase()

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These two functions share the same logic except ignore a different vma.

Let's reuse the code.

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20200809232057.23477-2-richard.weiyang@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-10-13 16:53:35 -07:00 committed by Linus Torvalds
parent 7c61f917b1
commit 4d1e72437b
1 changed files with 7 additions and 9 deletions
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16
mm/mmap.c
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@ -474,8 +474,12 @@ static __always_inline void vma_rb_erase_ignore(struct vm_area_struct *vma,
{
/*
* All rb_subtree_gap values must be consistent prior to erase,
* with the possible exception of the "next" vma being erased if
* next->vm_start was reduced.
* with the possible exception of
*
* a. the "next" vma being erased if next->vm_start was reduced in
* __vma_adjust() -> __vma_unlink()
* b. the vma being erased in detach_vmas_to_be_unmapped() ->
* vma_rb_erase()
*/
validate_mm_rb(root, ignore);
@ -485,13 +489,7 @@ static __always_inline void vma_rb_erase_ignore(struct vm_area_struct *vma,
static __always_inline void vma_rb_erase(struct vm_area_struct *vma,
struct rb_root *root)
{
/*
* All rb_subtree_gap values must be consistent prior to erase,
* with the possible exception of the vma being erased.
*/
validate_mm_rb(root, vma);
__vma_rb_erase(vma, root);
vma_rb_erase_ignore(vma, root, vma);
}
/*