VM: can't go through the inner loop in unmap_vmas() more than once...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 1b6712a9720d..f2317c85704e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1354,7 +1354,7 @@ unsigned long unmap_vmas(struct mmu_gather *tlb,
                 if (unlikely(is_pfn_mapping(vma)))
                         untrack_pfn_vma(vma, 0, 0);
 
-                while (start != end) {
+                if (start != end) {
                         if (unlikely(is_vm_hugetlb_page(vma))) {
                                 /*
                                  * It is undesirable to test vma->vm_file as it
@@ -1371,8 +1371,8 @@ unsigned long unmap_vmas(struct mmu_gather *tlb,
                                         unmap_hugepage_range(vma, start, end, NULL);
                         } else
                                 unmap_page_range(tlb, vma, start, end, details);
-                        start = end;
                 }
+                start = end;
         }
 
         mmu_notifier_invalidate_range_end(mm, start_addr, end_addr);