linux-kernel - [PATCH] mm: Update mask post pxd_clear

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Message-Id: <20250313181414.78512-1-dev.jain@arm.com>
Date: Thu, 13 Mar 2025 23:44:14 +0530
From: Dev Jain <dev.jain@....com>
To: jroedel@...e.de,
	akpm@...ux-foundation.org
Cc: ryan.roberts@....com,
	david@...hat.com,
	willy@...radead.org,
	hch@....de,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Dev Jain <dev.jain@....com>,
	stable@...r.kernel.org
Subject: [PATCH] mm: Update mask post pxd_clear_bad()

Since pxd_clear_bad() is an operation changing the state of the page tables,
we should call arch_sync_kernel_mappings() post this.

Fixes: e80d3909be42 ("mm: track page table modifications in __apply_to_page_range()")
Cc: <stable@...r.kernel.org>
Signed-off-by: Dev Jain <dev.jain@....com>
---
 mm/memory.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/memory.c b/mm/memory.c
index 78c7ee62795e..9a4a8c710be0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2987,6 +2987,7 @@ static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
 			if (!create)
 				continue;
 			pmd_clear_bad(pmd);
+			*mask = PGTBL_PMD_MODIFIED;
 		}
 		err = apply_to_pte_range(mm, pmd, addr, next,
 					 fn, data, create, mask);
@@ -3023,6 +3024,7 @@ static int apply_to_pud_range(struct mm_struct *mm, p4d_t *p4d,
 			if (!create)
 				continue;
 			pud_clear_bad(pud);
+			*mask = PGTBL_PUD_MODIFIED;
 		}
 		err = apply_to_pmd_range(mm, pud, addr, next,
 					 fn, data, create, mask);
@@ -3059,6 +3061,7 @@ static int apply_to_p4d_range(struct mm_struct *mm, pgd_t *pgd,
 			if (!create)
 				continue;
 			p4d_clear_bad(p4d);
+			*mask = PGTBL_P4D_MODIFIED;
 		}
 		err = apply_to_pud_range(mm, p4d, addr, next,
 					 fn, data, create, mask);
@@ -3095,6 +3098,7 @@ static int __apply_to_page_range(struct mm_struct *mm, unsigned long addr,
 			if (!create)
 				continue;
 			pgd_clear_bad(pgd);
+			mask = PGTBL_PGD_MODIFIED;
 		}
 		err = apply_to_p4d_range(mm, pgd, addr, next,
 					 fn, data, create, &mask);
-- 
2.30.2