From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Thu, 14 Apr 2022 06:07:16 +0000 (-0700)
Subject: mm: convert vma_lookup() to use mtree_load()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=47dc2bedc155c8cbdcd6fea93a9cf78304070aaa;p=users%2Fjedix%2Flinux-maple.git

mm: convert vma_lookup() to use mtree_load()

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.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d0d76c410e7..6bb43774a707 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2802,12 +2802,7 @@ 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)