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mm/memory-failure: unnecessary amount of unmapping

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[ Upstream commit 4d75136be8 ]

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/20210420002821.2749748-1-jane.chu@oracle.com
Fixes: 6100e34b25 ("mm, memory_failure: Teach memory_failure() about dev_pagemap pages")
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jane Chu 2021-04-29 23:02:19 -07:00 committed by Greg Kroah-Hartman
parent 62d96faa74
commit 949e7c5f49
1 changed files with 1 additions and 1 deletions
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2
mm/memory-failure.c
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@ -1293,7 +1293,7 @@ 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;