1 files changed, 2 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 5d3a7f23e..a84e73f2f 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -315,10 +315,12 @@ static void unuse_process(struct mm_struct * mm,
 	 */
 	if (!mm)
 		return;
+	vmlist_access_lock(mm);
 	for (vma = mm->mmap; vma; vma = vma->vm_next) {
 		pgd_t * pgd = pgd_offset(mm, vma->vm_start);
 		unuse_vma(vma, pgd, entry, page);
 	}
+	vmlist_access_unlock(mm);
 	return;
 }