From: Anshuman Khandual <anshuman.khandual@arm.com>
Date: Fri, 27 Feb 2026 04:03:00 +0000 (+0000)
Subject: mm: replace READ_ONCE() in pud_trans_unstable()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3d56d7317b271a1a5030ebb135c58aedc4c0fd36;p=thirdparty%2Flinux.git

mm: replace READ_ONCE() in pud_trans_unstable()

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>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 776993d4567b4..d2767a4c027b6 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -2004,7 +2004,7 @@ static inline int pud_trans_unstable(pud_t *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;