[PATCH v10 26/69] mm: convert vma_lookup() to use mtree_load()

Liam Howlett liam.howlett at oracle.com
Tue Jun 21 13:46:59 PDT 2022

From: "Liam R. Howlett" <Liam.Howlett at Oracle.com>

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.

Link: https://lkml.kernel.org/r/20220504011345.662299-11-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett at Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Acked-by: Vlastimil Babka <vbabka at suse.cz>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: David Howells <dhowells at redhat.com>
Cc: SeongJae Park <sj at kernel.org>
Cc: Will Deacon <will at kernel.org>
Cc: Davidlohr Bueso <dave at stgolabs.net>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
 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 b0a84f7c79fe..1b02988b6fc8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2808,12 +2808,7 @@ 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)

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