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Wed, 12 Nov 2025 17:47:04 -0800 (PST) From: Samuel Holland To: Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org, Andrew Morton , David Hildenbrand , linux-mm@kvack.org Cc: devicetree@vger.kernel.org, Suren Baghdasaryan , linux-kernel@vger.kernel.org, Mike Rapoport , Michal Hocko , Conor Dooley , Lorenzo Stoakes , Krzysztof Kozlowski , Alexandre Ghiti , Emil Renner Berthing , Rob Herring , Vlastimil Babka , "Liam R . Howlett" , Anshuman Khandual , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , linux-perf-users@vger.kernel.org, Samuel Holland Subject: [PATCH v3 04/22] perf/events: replace READ_ONCE() with standard page table accessors Date: Wed, 12 Nov 2025 17:45:17 -0800 Message-ID: <20251113014656.2605447-5-samuel.holland@sifive.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20251113014656.2605447-1-samuel.holland@sifive.com> References: <20251113014656.2605447-1-samuel.holland@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 32EFA180010 X-Stat-Signature: w6cnhbod1cma84xb98xjbgtz16g9rytr X-Rspam-User: X-HE-Tag: 1762998426-178429 X-HE-Meta: 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 qLI1PywS 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Anshuman Khandual 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 Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual Link: https://lore.kernel.org/r/20251006042622.1743675-1-anshuman.khandual@arm.com/ Signed-off-by: Samuel Holland --- Changes in v3: - Replace my patch with Anshuman Khandual's patch from LKML 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 1fd347da9026..fa4f9165bd94 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8122,7 +8122,7 @@ 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; @@ -8130,7 +8130,7 @@ 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; @@ -8138,7 +8138,7 @@ 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