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Wed, 08 Oct 2025 18:58:43 -0700 (PDT) From: Samuel Holland To: Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Conor Dooley , Alexandre Ghiti , Emil Renner Berthing , Andrew Morton , Rob Herring , Krzysztof Kozlowski , Samuel Holland Subject: [PATCH v2 02/18] perf/core: Replace READ_ONCE() with standard page table accessors Date: Wed, 8 Oct 2025 18:57:38 -0700 Message-ID: <20251009015839.3460231-3-samuel.holland@sifive.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20251009015839.3460231-1-samuel.holland@sifive.com> References: <20251009015839.3460231-1-samuel.holland@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 6xw8iahe8idoarbc9zyde7ro3hraacmg X-Rspamd-Queue-Id: 63C8420002 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1759975124-89776 X-HE-Meta: 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 QOmyxU0u flbc+/oLEOEGkqB9ZHH9iJVEwe2LzGP406AuqgSGAVL8ALyvjDnsSACNfBI/uPHUMOktm1Z98OgRQotJTVOCepfz7bIjD6+FexyQRWbjYa4XuAtjj3H7YIhL5cy3wmmX9DMCkIHT6nuI5aieuCPYg2UJeT5gE4JXerZuP5zF+yEAsj/yp949YxCiYlWqKs9nGrOWqFnGwsn+uNWKEq4UcoMk/dLw3f4IvdpaUQFgpBB7PcvqHCwgfzvpD4HQS0XLfVlXVseb+/cJ2qdmrOdc2xcU0gHXEGMn8FvzauijIfl7shReCPUawYiNniQXhTrBt1P4u9G8zW3oD9OdOQBTI5OUwVkzDiqeKWJ7sSy0nVf5q7H8aD0yLC9XMhQPzvBE5iEUQIgCDEhjp5MRXc9bSdS8VRYlG2mv+oH7Ez/W0rYJdBhxkvMMady5qhJ2o/0tyykmA4VjsEzg8i6HR07panCNsboyeED+WzhcuveYC5DeBAuk= 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: 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 --- 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