linux-kernel - [PATCH v2 02/18] perf/core: Replace READ_ONCE() with standard page table accessors

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Message-ID: <20251009015839.3460231-3-samuel.holland@sifive.com>
Date: Wed,  8 Oct 2025 18:57:38 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <pjw@...nel.org>,
	linux-riscv@...ts.infradead.org
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Conor Dooley <conor@...nel.org>,
	Alexandre Ghiti <alex@...ti.fr>,
	Emil Renner Berthing <kernel@...il.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH v2 02/18] perf/core: Replace READ_ONCE() with standard page table accessors

Replace READ_ONCE() with standard page table accessors, i.e. pXXp_get(),
which have a default implementation of READ_ONCE() if the architecture
does not override them.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

Changes in v2:
 - New patch for v2

 kernel/events/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 820127536e62b..952ba4e3d8815 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8110,7 +8110,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr)
 	pte_t *ptep, pte;
 
 	pgdp = pgd_offset(mm, addr);
-	pgd = READ_ONCE(*pgdp);
+	pgd = pgdp_get(pgdp);
 	if (pgd_none(pgd))
 		return 0;
 
@@ -8118,7 +8118,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr)
 		return pgd_leaf_size(pgd);
 
 	p4dp = p4d_offset_lockless(pgdp, pgd, addr);
-	p4d = READ_ONCE(*p4dp);
+	p4d = p4dp_get(p4dp);
 	if (!p4d_present(p4d))
 		return 0;
 
@@ -8126,7 +8126,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr)
 		return p4d_leaf_size(p4d);
 
 	pudp = pud_offset_lockless(p4dp, p4d, addr);
-	pud = READ_ONCE(*pudp);
+	pud = pudp_get(pudp);
 	if (!pud_present(pud))
 		return 0;
 
-- 
2.47.2