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Message-Id: <20251006042622.1743675-1-anshuman.khandual@arm.com>
Date: Mon, 6 Oct 2025 05:26:22 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-perf-users@...r.kernel.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH] perf/events: replace READ_ONCE() with standard page table accessors
Replace READ_ONCE() with standard page table accessors i.e pxdp_get() which
anyways default into READ_ONCE() in cases where platform does not override.
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-perf-users@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
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 820127536e62..952ba4e3d881 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;
--
2.30.2
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