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 3790470e5902c766848a9952667f6067a863b8d2..c69ad2ed481643a6e05bb7321a95c1ab03370c89 100644 (file)
--- 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)