linux-kernel - [PATCH] mm: move mask update out of the atomic context

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Message-ID: <20250623080440.3005693-1-agordeev@linux.ibm.com>
Date: Mon, 23 Jun 2025 10:04:40 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: move mask update out of the atomic context

There is not need to modify page table synchronization mask
while apply_to_pte_range() holds user page tables spinlock.

Signed-off-by: Alexander Gordeev <agordeev@...ux.ibm.com>
---
 mm/memory.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index 8eba595056fe..6849ab4e44bf 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3035,12 +3035,13 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 			}
 		} while (pte++, addr += PAGE_SIZE, addr != end);
 	}
-	*mask |= PGTBL_PTE_MODIFIED;
 
 	arch_leave_lazy_mmu_mode();
 
 	if (mm != &init_mm)
 		pte_unmap_unlock(mapped_pte, ptl);
+	*mask |= PGTBL_PTE_MODIFIED;
+
 	return err;
 }
 
-- 
2.48.1