When we split the PMD-mapped THP to the PTE-mapped THP, we should initialize the refcount of the withdrawn PTE page table page to HPAGE_PMD_NR, which ensures that we can release the PTE page table page when it is free(the refcount is 0). Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> --- mm/pgtable-generic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 4e640baf9794..523053e09dfa 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -186,6 +186,7 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) struct page, lru); if (pmd_huge_pte(mm, pmdp)) list_del(&pgtable->lru); + pte_ref_init(pgtable, pmdp, HPAGE_PMD_NR); return pgtable; } #endif -- 2.11.0
