[PATCH] mm/memory-failure: unecessary amount of unmapping

[Jane Chu]

It appears that unmap_mapping_range() actually takes a 'size' as its
third argument rather than a location, the current calling fashion
causes unecessary amount of unmapping to occur.

Fixes: 6100e34b2526e ("mm, memory_failure: Teach memory_failure() about 
dev_pagemap pages")
Signed-off-by: Jane Chu <jane....@oracle.com>
---
 mm/memory-failure.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index f7ed9559d494..85ad98c00fd9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1368,7 +1368,7 @@ static int memory_failure_dev_pagemap(unsigned long pfn, 
int flags,
                 * communicated in siginfo, see kill_proc()
                 */
                start = (page->index << PAGE_SHIFT) & ~(size - 1);
-               unmap_mapping_range(page->mapping, start, start + size, 0);
+               unmap_mapping_range(page->mapping, start, size, 0);
        }
        kill_procs(&tokill, flags & MF_MUST_KILL, !unmap_success, pfn, flags);
        rc = 0;
-- 
2.18.4