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/[email protected] Fixes: 6100e34 ("mm, memory_failure: Teach memory_failure() about dev_pagemap pages") Signed-off-by: Jane Chu <[email protected]> Reviewed-by: Dan Williams <[email protected]> Reviewed-by: Naoya Horiguchi <[email protected]> Cc: Dave Jiang <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
torvalds · Apr 30, 2021 · 4d75136 · 4d75136
1 parent 198fba4
commit 4d75136
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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;