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Commit 5b701b84 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds
Browse files

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: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 84317297

mm/huge_memory.c

+3 −1
Original line number Diff line number Diff line
@@ -2978,7 +2978,9 @@ void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address, 
	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 {