From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: [PATCH v3 23/51] arm,smp: Remove trace_.*_rcuidle() usage Date: Thu, 12 Jan 2023 20:43:37 +0100 Message-ID: <20230112195540.743432118@infradead.org> References: <20230112194314.845371875@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org 2914481FD1 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org 628EE81FAC DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 17C6F41151 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org E8661405F3 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=Hsr5V6aaf/kVSU2t73jNDRAWfLY8tgaZMY/8xmM8jWo=; b=gQ7Q9SfcfOCGLlvaFWMPSlQDV4 uKjocE/2Y34Nr3Jz761/H3K8ref7D/RHB23EoGkYYy1xOk3Feint61cmEzrTeJs9pKFsRiW2qqfOc a15g0aXUVDz0ZDo2MzRyxqBDaXdm6wfbxfKkhacFzf0dnqhRTBbnGYC0Ol79TQuuLMUcvUsmgrQsq Yw8OLwDnAiMOrgLy6Ivt5nddQwxIy8BHKaVFy+WqtLrCrntFsEUj0zjrnvFhZolV0YjTu4WNDYy9/ lDKMy9PbKPpnqJnECPubZ+WdVv92KEL7klGQq9pXFCJdS/Q4cXnTA6nMiHYLM5YqQGCUzlZ7euq5h XbhFNewA==; List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: peterz@infradead.org Cc: juri.lelli@redhat.com, "Rafael J. Wysocki" , rafael@kernel.org, catalin.marinas@arm.com, linus.walleij@linaro.org, nsekhar@ti.com, bsegall@google.com, guoren@kernel.org, pavel@ucw.cz, agordeev@linux.ibm.com, linux-arch@vger.kernel.org, linux-samsung-soc@vger.kernel.org, vincent.guittot@linaro.org, mpe@ellerman.id.au, chenhuacai@kernel.org, christophe.leroy@csgroup.eu, linux-acpi@vger.kernel.org, agross@kernel.org, geert@linux-m68k.org, linux-imx@nxp.com, vgupta@kernel.org, mattst88@gmail.com, mturquette@baylibre.com, sammy@sammy.net, pmladek@suse.com, linux-pm@vger.kernel.org, Sascha Hauer , linux-um@lists.infradead.org, npiggin@gmail.com, tglx@linutronix.de, linux-omap@vger.kernel.org, dietmar.eggemann@arm.com, andreyknvl@gmail.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel. None of these functions should ever be ran with RCU disabled anymore. Specifically, do_handle_IPI() is only called from handle_IPI() which explicitly does irq_enter()/irq_exit() which ensures RCU is watching. The problem with smp_cross_call() was, per commit 7c64cc0531fa ("arm: Use _rcuidle for smp_cross_call() tracepoints"), that cpuidle_enter_state_coupled() already had RCU disabled, but that's long been fixed by commit 1098582a0f6c ("sched,idle,rcu: Push rcu_idle deeper into the idle path"). Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Ulf Hansson Acked-by: Rafael J. Wysocki Acked-by: Frederic Weisbecker Tested-by: Tony Lindgren Tested-by: Ulf Hansson --- arch/arm/kernel/smp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -639,7 +639,7 @@ static void do_handle_IPI(int ipinr) unsigned int cpu = smp_processor_id(); if ((unsigned)ipinr < NR_IPI) - trace_ipi_entry_rcuidle(ipi_types[ipinr]); + trace_ipi_entry(ipi_types[ipinr]); switch (ipinr) { case IPI_WAKEUP: @@ -686,7 +686,7 @@ static void do_handle_IPI(int ipinr) } if ((unsigned)ipinr < NR_IPI) - trace_ipi_exit_rcuidle(ipi_types[ipinr]); + trace_ipi_exit(ipi_types[ipinr]); } /* Legacy version, should go away once all irqchips have been converted */ @@ -709,7 +709,7 @@ static irqreturn_t ipi_handler(int irq, static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) { - trace_ipi_raise_rcuidle(target, ipi_types[ipinr]); + trace_ipi_raise(target, ipi_types[ipinr]); __ipi_send_mask(ipi_desc[ipinr], target); }