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[31.30.173.61]) by smtp.gmail.com with ESMTPSA id 12-20020a170906300c00b0077a1dd3e7b7sm1746796ejz.102.2022.10.14.08.58.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Oct 2022 08:58:49 -0700 (PDT) From: Andrew Jones To: x86@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 2/2] x86: Fix /proc/cpuinfo cpumask warning Date: Fri, 14 Oct 2022 17:58:45 +0200 Message-Id: <20221014155845.1986223-3-ajones@ventanamicro.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221014155845.1986223-1-ajones@ventanamicro.com> References: <20221014155845.1986223-1-ajones@ventanamicro.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jonas Bonn , linux-s390@vger.kernel.org, Alexander Gordeev , Albert Ou , Vasily Gorbik , Yury Norov , Heiko Carstens , Dave Hansen , Stefan Kristiansson , Ingo Molnar , Borislav Petkov , Paul Walmsley , Palmer Dabbelt , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Stafford Horne , openrisc@lists.librecores.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Commit 78e5a3399421 ("cpumask: fix checking valid cpu range") has started issuing warnings[*] when cpu indices equal to nr_cpu_ids - 1 are passed to cpumask_next* functions. seq_read_iter() and cpuinfo's start and next seq operations implement a pattern like n = cpumask_next(n - 1, mask); show(n); while (1) { ++n; n = cpumask_next(n - 1, mask); if (n >= nr_cpu_ids) break; show(n); } which will issue the warning when reading /proc/cpuinfo. Ensure no warning is generated by validating the cpu index before calling cpumask_next(). [*] Warnings will only appear with DEBUG_PER_CPU_MAPS enabled. Signed-off-by: Andrew Jones Cc: Yury Norov --- arch/x86/kernel/cpu/proc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c index 099b6f0d96bd..de3f93ac6e49 100644 --- a/arch/x86/kernel/cpu/proc.c +++ b/arch/x86/kernel/cpu/proc.c @@ -153,6 +153,9 @@ static int show_cpuinfo(struct seq_file *m, void *v) static void *c_start(struct seq_file *m, loff_t *pos) { + if (*pos == nr_cpu_ids) + return NULL; + *pos = cpumask_next(*pos - 1, cpu_online_mask); if ((*pos) < nr_cpu_ids) return &cpu_data(*pos); -- 2.37.3