mm: Convert vma_lookup() to use the Maple Tree

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

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ec549a985e6967d003baba7a18095fa127fa6f7c..6717446d2f81d6cb0ec112dad4fefe3a9c580291 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2739,12 +2739,7 @@ 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)