The patch titled
Subject: mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2
has been added to the -mm tree. Its filename is
mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2.patch
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------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2
Link: http://lkml.kernel.org/r/1463070742-18401-1-git-send-email-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Reviewed-by: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff -puN mm/huge_memory.c~mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2 mm/huge_memory.c
--- a/mm/huge_memory.c~mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2
+++ a/mm/huge_memory.c
@@ -3248,8 +3248,12 @@ int page_trans_huge_mapcount(struct page
/* hugetlbfs shouldn't call it */
VM_BUG_ON_PAGE(PageHuge(page), page);
- if (likely(!PageTransCompound(page)))
- return atomic_read(&page->_mapcount) + 1;
+ if (likely(!PageTransCompound(page))) {
+ mapcount = atomic_read(&page->_mapcount) + 1;
+ if (total_mapcount)
+ *total_mapcount = mapcount;
+ return mapcount;
+ }
page = compound_head(page);
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults.patch
mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix.patch
mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults-fix-2.patch
mm-thp-microoptimize-compound_mapcount.patch
mm-thp-split_huge_pmd_address-comment-improvement.patch
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