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

[Hugh Dickins]

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@xxxxxxxxxx>
Reported-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-mm/0df84f9f-e9b0-80b1-4c9e-95abc1a73a96@xxxxxxxxxxxxx/
---
 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);
 		nr_ptes++;
 	}
-- 
2.35.3