[PATCH] dbg, rmap: avoid flushing TLB in batch if PTE is inaccessible

[Huang Ying]

Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
---
 mm/rmap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 8632e02661ac..3c7c43642d7c 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1582,7 +1582,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
 				 */
 				pteval = ptep_get_and_clear(mm, address, pvmw.pte);
 
-				set_tlb_ubc_flush_pending(mm, pte_dirty(pteval));
+				if (pte_accessible(mm, pteval))
+					set_tlb_ubc_flush_pending(mm, pte_dirty(pteval));
 			} else {
 				pteval = ptep_clear_flush(vma, address, pvmw.pte);
 			}
@@ -1963,7 +1964,8 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
 				 */
 				pteval = ptep_get_and_clear(mm, address, pvmw.pte);
 
-				set_tlb_ubc_flush_pending(mm, pte_dirty(pteval));
+				if (pte_accessible(mm, pteval))
+					set_tlb_ubc_flush_pending(mm, pte_dirty(pteval));
 			} else {
 				pteval = ptep_clear_flush(vma, address, pvmw.pte);
 			}
-- 
2.30.2