[PATCH 05/14] mm: khugepaged: __collapse_huge_page_swapin() use pte_offset_map_readonly_nolock()

From: Qi Zheng
Date: Wed Aug 21 2024 - 04:56:08 EST


In __collapse_huge_page_swapin(), we just use the ptl for pte_same() check
in do_swap_page(). In other places, we directly use pte_offset_map_lock(),
so convert it to using pte_offset_map_readonly_nolock().

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
mm/khugepaged.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index cdd1d8655a76b..26c083c59f03f 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1009,7 +1009,11 @@ static int __collapse_huge_page_swapin(struct mm_struct *mm,
};

if (!pte++) {
- pte = pte_offset_map_nolock(mm, pmd, address, &ptl);
+ /*
+ * Here the ptl is only used to check pte_same() in
+ * do_swap_page(), so readonly version is enough.
+ */
+ pte = pte_offset_map_readonly_nolock(mm, pmd, address, &ptl);
if (!pte) {
mmap_read_unlock(mm);
result = SCAN_PMD_NULL;
--
2.20.1