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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2015-09-08 14:59:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 15:35:28 -0700 |
| commit | 5b701b846aad7909d20693bcced2522d0ce8d1bc (patch) | |
| tree | d3cf24a5345a513cf95eeb412d1863c18266d13b /mm/huge_memory.c | |
| parent | 843172978bb92997310d2f7fbc172ece423cfc02 (diff) | |
| download | linux-stable-5b701b846aad7909d20693bcced2522d0ce8d1bc.tar.gz linux-stable-5b701b846aad7909d20693bcced2522d0ce8d1bc.tar.bz2 linux-stable-5b701b846aad7909d20693bcced2522d0ce8d1bc.zip | |
thp: decrement refcount on huge zero page if it is split
The DAX code neglected to put the refcount on the huge zero page.
Also we must notify on splits.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 5df0d1597c15..7510b6f683e9 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2978,7 +2978,9 @@ again: if (unlikely(!pmd_trans_huge(*pmd))) goto unlock; if (vma_is_dax(vma)) { - pmdp_huge_clear_flush(vma, haddr, pmd); + pmd_t _pmd = pmdp_huge_clear_flush_notify(vma, haddr, pmd); + if (is_huge_zero_pmd(_pmd)) + put_huge_zero_page(); } else if (is_huge_zero_pmd(*pmd)) { __split_huge_zero_page_pmd(vma, haddr, pmd); } else { |