The quilt patch titled
Subject: mm: use ptep_get() instead of directly dereferencing pte_t*
has been removed from the -mm tree. Its filename was
mm-use-ptep_get-instead-of-directly-dereferencing-pte_t.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Ryan Roberts <ryan.roberts@xxxxxxx>
Subject: mm: use ptep_get() instead of directly dereferencing pte_t*
Date: Mon, 10 Mar 2025 14:04:17 +0000
It is best practice for all pte accesses to go via the arch helpers, to
ensure non-torn values and to allow the arch to intervene where needed
(contpte for arm64 for example). While in this case it was probably safe
to directly dereference, let's tidy it up for consistency.
Link: https://lkml.kernel.org/r/20250310140418.1737409-1-ryan.roberts@xxxxxxx
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Reviewed-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reviewed-by: Dev Jain <dev.jain@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/migrate.c~mm-use-ptep_get-instead-of-directly-dereferencing-pte_t
+++ a/mm/migrate.c
@@ -202,7 +202,7 @@ static bool try_to_map_unused_to_zeropag
return false;
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(pte_present(*pvmw->pte), page);
+ VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page);
if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) ||
mm_forbids_zeropage(pvmw->vma->vm_mm))
_
Patches currently in -mm which might be from ryan.roberts@xxxxxxx are
