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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>
This commit is contained in:
Kirill A. Shutemov 2015-09-08 14:59:28 -07:00 committed by Linus Torvalds
parent 843172978b
commit 5b701b846a
1 changed files with 3 additions and 1 deletions
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4
mm/huge_memory.c
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@ -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 {