[PATCH v3 10/13 fix2] mm/khugepaged: collapse_pte_mapped_thp() with mmap_read_lock(): fix2

Hugh Dickins hughd at google.com
Sun Aug 6 13:59:27 AEST 2023

Use ptep_clear() instead of pte_clear(): when CONFIG_PAGE_TABLE_CHECK=y,
ptep_clear() adds some accounting, missing which would cause a BUG later.

Signed-off-by: Hugh Dickins <hughd at google.com>
Reported-by: Qi Zheng <zhengqi.arch at bytedance.com>
Closes: https://lore.kernel.org/linux-mm/0df84f9f-e9b0-80b1-4c9e-95abc1a73a96@bytedance.com/
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index bb76a5d454de..78fc1a24a1cc 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1603,7 +1603,7 @@ int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr,
 		 * TLB flush can be left until pmdp_collapse_flush() does it.
 		 * PTE dirty? Shmem page is already dirty; file is read-only.
-		pte_clear(mm, addr, pte);
+		ptep_clear(mm, addr, pte);
 		page_remove_rmap(page, vma, false);

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