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mm/pagewalk: add walk_page_range_vma() 

Let's add walk_page_range_vma(), which is similar to walk_page_vma(),
however, is only interested in a subset of the VMA range.

To be used in KSM code to stop using follow_page() next.

Link: https://lkml.kernel.org/r/20221021101141.84170-8-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2022-10-21 12:11:39 +02:00 committed by Andrew Morton
parent 6cce3314b9
commit e07cda5f23
2 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/pagewalk.h
View File

@ -101,6 +101,9 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start,
unsigned long end, const struct mm_walk_ops *ops,
pgd_t *pgd,
void *private);
int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start,
unsigned long end, const struct mm_walk_ops *ops,
void *private);
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
void *private);
int walk_page_mapping(struct address_space *mapping, pgoff_t first_index,

20
mm/pagewalk.c
View File

@ -517,6 +517,26 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start,
return walk_pgd_range(start, end, &walk);
}
int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start,
unsigned long end, const struct mm_walk_ops *ops,
void *private)
{
struct mm_walk walk = {
.ops = ops,
.mm = vma->vm_mm,
.vma = vma,
.private = private,
};
if (start >= end || !walk.mm)
return -EINVAL;
if (start < vma->vm_start || end > vma->vm_end)
return -EINVAL;
mmap_assert_locked(walk.mm);
return __walk_page_range(start, end, &walk);
}
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
void *private)
{