From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5ffdcaa..326d17e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2951,7 +2951,9 @@ 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 {
--
2.1.4
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