+ mm-replace-read_once-in-pud_trans_unstable.patch added to mm-new branch

+ mm-replace-read_once-in-pud_trans_unstable.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm: replace READ_ONCE() in pud_trans_unstable()
has been added to the -mm mm-new branch.  Its filename is
     mm-replace-read_once-in-pud_trans_unstable.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-replace-read_once-in-pud_trans_unstable.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: mm: replace READ_ONCE() in pud_trans_unstable()
Date: Fri, 27 Feb 2026 04:03:00 +0000

Replace READ_ONCE() with the existing standard page table accessor for PUD
aka pudp_get() in pud_trans_unstable().  This does not create any
functional change for platforms that do not override pudp_get(), which
still defaults to READ_ONCE().

Link: https://lkml.kernel.org/r/20260227040300.2091901-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: SeongJae Park <sj@kernel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/pgtable.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/pgtable.h~mm-replace-read_once-in-pud_trans_unstable
+++ a/include/linux/pgtable.h
@@ -2042,7 +2042,7 @@ static inline int pud_trans_unstable(pud
 {
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
 	defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
-	pud_t pudval = READ_ONCE(*pud);
+	pud_t pudval = pudp_get(pud);
 
 	if (pud_none(pudval) || pud_trans_huge(pudval))
 		return 1;
_

Patches currently in -mm which might be from anshuman.khandual@arm.com are

mm-debug_vm_pgtable-replace-write_once-with-pxd_clear.patch
mm-replace-read_once-in-pud_trans_unstable.patch