[PATCH v7 22/70] mm: Optimize find_exact_vma() to use vma_lookup()

Liam Howlett
2022-04-04T14:36:21Z

Use vma_lookup() to walk the tree to the start value requested. If
the vma at the start does not match, then the answer is NULL and there
is no need to look at the next vma the way that find_vma() would.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
---
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ae83d2440bef..65aace45e770 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2855,7 +2855,7 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma)
static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
unsigned long vm_start, unsigned long vm_end)
{
- struct vm_area_struct *vma = find_vma(mm, vm_start);
+ struct vm_area_struct *vma = vma_lookup(mm, vm_start);

if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
vma = NULL;
--
2.34.1