[178/178] mm/memory-failure: unnecessary amount of unmapping

Commit Message

Andrew Morton April 30, 2021, 6:02 a.m. UTC

From: Jane Chu <[e-mail]>
Subject: mm/memory-failure: unnecessary amount of unmapping

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

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 6100e34b2526e ("mm, memory_failure: Teach memory_failure() about dev_pagemap pages")
Signed-off-by: Jane Chu <[e-mail]>
Reviewed-by: Dan Williams <[e-mail]>
Reviewed-by: Naoya Horiguchi <[e-mail]>
Cc: Dave Jiang <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/memory-failure.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

--- a/mm/memory-failure.c~mm-memory-failure-unecessary-amount-of-unmapping
+++ a/mm/memory-failure.c
@@ -1368,7 +1368,7 @@  static int memory_failure_dev_pagemap(un
 		 * 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;