+ mm-memory-failure-unecessary-amount-of-unmapping.patch added to -mm tree

+ mm-memory-failure-unecessary-amount-of-unmapping.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/memory-failure: unnecessary amount of unmapping
has been added to the -mm tree.  Its filename is
     mm-memory-failure-unecessary-amount-of-unmapping.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memory-failure-unecessary-amount-of-unmapping.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory-failure-unecessary-amount-of-unmapping.patch

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------------------------------------------------------
From: Jane Chu <jane.chu@oracle.com>
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
unecessary amount of unmapping to occur.

Link: https://lkml.kernel.org/r/20210420002821.2749748-1-jane.chu@oracle.com
Fixes: 6100e34b2526e ("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>
---

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

--- 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;
_

Patches currently in -mm which might be from jane.chu@oracle.com are

mm-memory-failure-unecessary-amount-of-unmapping.patch