[PATCH v7 28/70] mm: Convert vma_lookup() to use mtree_load()

Liam Howlett
2022-04-04T14:37:03Z

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

Unlike the rbtree, the Maple Tree will return a NULL if there's
nothing at a particular address.

Since the previous commit dropped the vmacache, it is now possible to
consult the tree directly.

Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
include/linux/mm.h | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c6dd177bbbe8..7e39bdb5769b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2800,12 +2800,7 @@ struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
static inline
struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr)
{
- struct vm_area_struct *vma = find_vma(mm, addr);
-
- if (vma && addr < vma->vm_start)
- vma = NULL;
-
- return vma;
+ return mtree_load(&mm->mm_mt, addr);
}

static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
--
2.34.1