From: Zi Yan <[email protected]> Page count increase needs to goto the head of the PUD page.
Signed-off-by: Zi Yan <[email protected]> --- mm/huge_memory.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 5f83f4c5eac7..bbdbc9ae06bf 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3198,7 +3198,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, unsigned long haddr, bool freeze) { struct mm_struct *mm = vma->vm_mm; - struct page *page; + struct page *page, *head; pgtable_t pgtable; pmd_t old_pmd, _pmd; bool young, write, soft_dirty, pmd_migration = false; @@ -3285,7 +3285,8 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, soft_dirty = pmd_soft_dirty(old_pmd); } VM_BUG_ON_PAGE(!page_count(page), page); - page_ref_add(page, HPAGE_PMD_NR - 1); + head = compound_head(page); + page_ref_add(head, HPAGE_PMD_NR - 1); /* * Withdraw the table only after we mark the pmd entry invalid. -- 2.20.1
