1 files changed, 7 insertions, 2 deletions

diff --git a/mm/mlock.c b/mm/mlock.c
index d63802663242..d480cd6fc475 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -379,10 +379,14 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec,
 
         /*
          * Initialize pte walk starting at the already pinned page where we
-         * are sure that there is a pte.
+         * are sure that there is a pte, as it was pinned under the same
+         * mmap_sem write op.
          */
         pte = get_locked_pte(vma->vm_mm, start, &ptl);
-        end = min(end, pmd_addr_end(start, end));
+        /* Make sure we do not cross the page table boundary */
+        end = pgd_addr_end(start, end);
+        end = pud_addr_end(start, end);
+        end = pmd_addr_end(start, end);
 
         /* The page next to the pinned page is the first we will try to get */
         start += PAGE_SIZE;
@@ -736,6 +740,7 @@ static int do_mlockall(int flags)
 
                 /* Ignore errors */
                 mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags);
+                cond_resched();
         }
 out:
         return 0;