Message ID | 20230519101840.v5.5.I654063e53782b11d53e736a8ad4897ffd207406a@changeid |
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State | New |
Headers | show
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Fri, 19 May 2023 10:20:51 -0700 (PDT) From: Douglas Anderson <dianders@chromium.org> To: Petr Mladek <pmladek@suse.com>, Andrew Morton <akpm@linux-foundation.org> Cc: Matthias Kaehlcke <mka@chromium.org>, kgdb-bugreport@lists.sourceforge.net, Stephane Eranian <eranian@google.com>, mpe@ellerman.id.au, Tzung-Bi Shih <tzungbi@chromium.org>, Daniel Thompson <daniel.thompson@linaro.org>, Mark Rutland <mark.rutland@arm.com>, linuxppc-dev@lists.ozlabs.org, Sumit Garg <sumit.garg@linaro.org>, npiggin@gmail.com, davem@davemloft.net, Marc Zyngier <maz@kernel.org>, Stephen Boyd <swboyd@chromium.org>, sparclinux@vger.kernel.org, christophe.leroy@csgroup.eu, Catalin Marinas <catalin.marinas@arm.com>, ravi.v.shankar@intel.com, Randy Dunlap <rdunlap@infradead.org>, Pingfan Liu <kernelfans@gmail.com>, Guenter Roeck <groeck@chromium.org>, Lecopzer Chen <lecopzer.chen@mediatek.com>, Ian Rogers <irogers@google.com>, ito-yuichi@fujitsu.com, ricardo.neri@intel.com, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, Will Deacon <will@kernel.org>, Chen-Yu Tsai <wens@csie.org>, linux-kernel@vger.kernel.org, Masayoshi Mizuma <msys.mizuma@gmail.com>, Andi Kleen <ak@linux.intel.com>, Douglas Anderson <dianders@chromium.org> Subject: [PATCH v5 05/18] watchdog/perf: Ensure CPU-bound context when creating hardlockup detector event Date: Fri, 19 May 2023 10:18:29 -0700 Message-ID: <20230519101840.v5.5.I654063e53782b11d53e736a8ad4897ffd207406a@changeid> X-Mailer: git-send-email 2.40.1.698.g37aff9b760-goog In-Reply-To: <20230519101840.v5.18.Ia44852044cdcb074f387e80df6b45e892965d4a1@changeid> References: <20230519101840.v5.18.Ia44852044cdcb074f387e80df6b45e892965d4a1@changeid> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <sparclinux.vger.kernel.org> X-Mailing-List: sparclinux@vger.kernel.org |
Series |
watchdog/hardlockup: Add the buddy hardlockup detector
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expand
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diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c index 1e8a49dc956e..2125b09e09d7 100644 --- a/kernel/watchdog_hld.c +++ b/kernel/watchdog_hld.c @@ -165,10 +165,16 @@ static void watchdog_overflow_callback(struct perf_event *event, static int hardlockup_detector_event_create(void) { - unsigned int cpu = smp_processor_id(); + unsigned int cpu; struct perf_event_attr *wd_attr; struct perf_event *evt; + /* + * Preemption is not disabled because memory will be allocated. + * Ensure CPU-locality by calling this in per-CPU kthread. + */ + WARN_ON(!is_percpu_thread()); + cpu = raw_smp_processor_id(); wd_attr = &wd_hw_attr; wd_attr->sample_period = hw_nmi_get_sample_period(watchdog_thresh);