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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pL3xn-006qUR-F4; Thu, 26 Jan 2023 15:14:56 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 88EC6302D60; Thu, 26 Jan 2023 16:14:54 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 34A262084C4B0; Thu, 26 Jan 2023 16:14:53 +0100 (CET) Message-ID: <20230126151323.819534689@infradead.org> User-Agent: quilt/0.66 Date: Thu, 26 Jan 2023 16:08:38 +0100 From: Peter Zijlstra To: mingo@kernel.org Subject: [PATCH v2 9/9] cpuidle: Fix poll_idle() noinstr annotation References: <20230126150829.087606759@infradead.org> MIME-Version: 1.0 Cc: mark.rutland@arm.com, juri.lelli@redhat.com, daniel.lezcano@linaro.org, wanpengli@tencent.com, kvm@vger.kernel.org, rafael@kernel.org, peterz@infradead.org, lpieralisi@kernel.org, dave.hansen@linux.intel.com, virtualization@lists.linux-foundation.org, bsegall@google.com, amakhalov@vmware.com, will@kernel.org, tglx@linutronix.de, vschneid@redhat.com, hpa@zytor.com, x86@kernel.org, pv-drivers@vmware.com, mingo@redhat.com, mgorman@suse.de, longman@redhat.com, frederic@kernel.org, linux-trace-kernel@vger.kernel.org, paulmck@kernel.org, linux-pm@vger.kernel.org, boqun.feng@gmail.com, rostedt@goodmis.org, bp@alien8.de, vincent.guittot@linaro.org, boris.ostrovsky@oracle.com, dietmar.eggemann@arm.com, jgross@suse.com, seanjc@google.com, linux-kernel@vger.kernel.org, kernel test robot , mhiramat@kernel.org, pbonzini@redhat.com, bristot@redhat.com X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" The instrumentation_begin()/end() annotations in poll_idle() were complete nonsense. Specifically they caused tracing to happen in the middle of noinstr code, resulting in RCU splats. Now that local_clock() is noinstr, mark up the rest and let it rip. Fixes: 00717eb8c955 ("cpuidle: Annotate poll_idle()") Signed-off-by: Peter Zijlstra (Intel) Reported-by: kernel test robot Acked-by: Rafael J. Wysocki Link: https://lore.kernel.org/oe-lkp/202301192148.58ece903-oliver.sang@intel.com --- drivers/cpuidle/cpuidle.c | 2 +- drivers/cpuidle/poll_state.c | 2 -- 2 files changed, 1 insertion(+), 3 deletions(-) --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -426,7 +426,7 @@ void cpuidle_reflect(struct cpuidle_devi * @dev: the cpuidle device * */ -u64 cpuidle_poll_time(struct cpuidle_driver *drv, +__cpuidle u64 cpuidle_poll_time(struct cpuidle_driver *drv, struct cpuidle_device *dev) { int i; --- a/drivers/cpuidle/poll_state.c +++ b/drivers/cpuidle/poll_state.c @@ -15,7 +15,6 @@ static int __cpuidle poll_idle(struct cp { u64 time_start; - instrumentation_begin(); time_start = local_clock(); dev->poll_time_limit = false; @@ -42,7 +41,6 @@ static int __cpuidle poll_idle(struct cp raw_local_irq_disable(); current_clr_polling(); - instrumentation_end(); return index; } _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization