From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: [PATCH v3 46/51] arm64,riscv,perf: Remove RCU_NONIDLE() usage Date: Thu, 12 Jan 2023 20:44:00 +0100 Message-ID: <20230112195542.151174682@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 smtp2.osuosl.org 8D2A7414E7 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 7BBC4414E6 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 4161960E48 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 4213660E96 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=ljNIHChdlymEt0s4DtY+Ji5/5ZFr1jFKrzucPLjcAFA=; b=UFhO8sQycbOykP9WLmHLr8syH1 9tKpgf+RH4+2oIWu+p1NsZyG1ZQUQEWQKyB7rZeJqKLqT/EpPMTLJSHpi/eniYQI6kNhYX80bC7rp v4DYtLIywV5PM3hyi+6d9VreCBIfyUq0bOE4EJwgP1PAPqwc5ULRKbQuNPzHKcYXFJ+bhA18Sk3BK 0SHi+ZzW5d72kp/7epWf2U0Zao67mw1W6KZFzu9PuzdtQCB/RZo73P/7KFSV/9Z+EgMtlu14sgzCt LY3p+teRO7dsISyeJIOJS/fTB2tiC6ZycPsflBP3cBseh7aef5nb+O7jgwPbkvWsd95ol/bFuNb6B 77LSYyRg==; 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. The PM notifiers should no longer be ran with RCU disabled (per the previous patches), as such this hack is no longer required either. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Rafael J. Wysocki Acked-by: Frederic Weisbecker Tested-by: Tony Lindgren Tested-by: Ulf Hansson --- drivers/perf/arm_pmu.c | 11 +---------- drivers/perf/riscv_pmu_sbi.c | 8 +------- 2 files changed, 2 insertions(+), 17 deletions(-) --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -762,17 +762,8 @@ static void cpu_pm_pmu_setup(struct arm_ case CPU_PM_ENTER_FAILED: /* * Restore and enable the counter. - * armpmu_start() indirectly calls - * - * perf_event_update_userpage() - * - * that requires RCU read locking to be functional, - * wrap the call within RCU_NONIDLE to make the - * RCU subsystem aware this cpu is not idle from - * an RCU perspective for the armpmu_start() call - * duration. */ - RCU_NONIDLE(armpmu_start(event, PERF_EF_RELOAD)); + armpmu_start(event, PERF_EF_RELOAD); break; default: break; --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -747,14 +747,8 @@ static int riscv_pm_pmu_notify(struct no case CPU_PM_ENTER_FAILED: /* * Restore and enable the counter. - * - * Requires RCU read locking to be functional, - * wrap the call within RCU_NONIDLE to make the - * RCU subsystem aware this cpu is not idle from - * an RCU perspective for the riscv_pmu_start() call - * duration. */ - RCU_NONIDLE(riscv_pmu_start(event, PERF_EF_RELOAD)); + riscv_pmu_start(event, PERF_EF_RELOAD); break; default: break;