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mm: add vma_iter_{next,prev}_range() to vma iterator

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Add functionality to the VMA iterator to advance and retreat one offset
within the maple tree, regardless of the value contained.  This can lead
to less re-walking to find an area of interest, especially when there is
nothing in that offset.

Link: https://lkml.kernel.org/r/20230518145544.1722059-35-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: David Binderman <dcb314@hotmail.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Vernon Yang <vernon2gm@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-05-18 10:55:43 -04:00 committed by Andrew Morton
parent eb2e817f38
commit bb5dbd2272
1 changed files with 13 additions and 0 deletions
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13
include/linux/mm.h
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@ -866,11 +866,24 @@ static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi)
return mas_find(&vmi->mas, ULONG_MAX);
}
static inline
struct vm_area_struct *vma_iter_next_range(struct vma_iterator *vmi)
{
return mas_next_range(&vmi->mas, ULONG_MAX);
}
static inline struct vm_area_struct *vma_prev(struct vma_iterator *vmi)
{
return mas_prev(&vmi->mas, 0);
}
static inline
struct vm_area_struct *vma_iter_prev_range(struct vma_iterator *vmi)
{
return mas_prev_range(&vmi->mas, 0);
}
static inline unsigned long vma_iter_addr(struct vma_iterator *vmi)
{
return vmi->mas.index;