linux-kernel - [PATCH v3 03/22] mm/dirty: replace READ_ONCE() with pudp

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Message-ID: <20251113014656.2605447-4-samuel.holland@sifive.com>
Date: Wed, 12 Nov 2025 17:45:16 -0800
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <pjw@...nel.org>,
	linux-riscv@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	linux-mm@...ck.org
Cc: devicetree@...r.kernel.org,
	Suren Baghdasaryan <surenb@...gle.com>,
	linux-kernel@...r.kernel.org,
	Mike Rapoport <rppt@...nel.org>,
	Michal Hocko <mhocko@...e.com>,
	Conor Dooley <conor@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Alexandre Ghiti <alex@...ti.fr>,
	Emil Renner Berthing <kernel@...il.dk>,
	Rob Herring <robh+dt@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Dev Jain <dev.jain@....com>,
	Oscar Salvador <osalvador@...e.de>,
	Lance Yang <lance.yang@...ux.dev>,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH v3 03/22] mm/dirty: replace READ_ONCE() with pudp_get()

From: Anshuman Khandual <anshuman.khandual@....com>

Replace READ_ONCE() with a standard page table accessor i.e pudp_get() that
anyways defaults into READ_ONCE() in cases where platform does not override

Link: https://lkml.kernel.org/r/20251006055214.1845342-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
Acked-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Dev Jain <dev.jain@....com>
Reviewed-by: Oscar Salvador <osalvador@...e.de>
Cc: Lance Yang <lance.yang@...ux.dev>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

Changes in v3:
 - New patch for v3 (cherry-picked from linux-next)

 mm/mapping_dirty_helpers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mapping_dirty_helpers.c b/mm/mapping_dirty_helpers.c
index c193de6cb23a..737c407f4081 100644
--- a/mm/mapping_dirty_helpers.c
+++ b/mm/mapping_dirty_helpers.c
@@ -149,7 +149,7 @@ static int wp_clean_pud_entry(pud_t *pud, unsigned long addr, unsigned long end,
 			      struct mm_walk *walk)
 {
 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
-	pud_t pudval = READ_ONCE(*pud);
+	pud_t pudval = pudp_get(pud);
 
 	/* Do not split a huge pud */
 	if (pud_trans_huge(pudval)) {
-- 
2.47.2