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.

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>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1d37cc4ff87107c9e0b011278433b4e33d72e124..d2090336d2de345274edc35674ba7ab8b53c4a68 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2801,12 +2801,7 @@ 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)