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Date: Mon, 19 Sep 2022 12:00:23 +0200 From: Peter Zijlstra <peterz@...radead.org> To: peterz@...radead.org Cc: richard.henderson@...aro.org, ink@...assic.park.msu.ru, mattst88@...il.com, vgupta@...nel.org, linux@...linux.org.uk, ulli.kroll@...glemail.com, linus.walleij@...aro.org, shawnguo@...nel.org, Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de, festevam@...il.com, linux-imx@....com, tony@...mide.com, khilman@...nel.org, catalin.marinas@....com, will@...nel.org, guoren@...nel.org, bcain@...cinc.com, chenhuacai@...nel.org, kernel@...0n.name, geert@...ux-m68k.org, sammy@...my.net, monstr@...str.eu, tsbogend@...ha.franken.de, dinguyen@...nel.org, jonas@...thpole.se, stefan.kristiansson@...nalahti.fi, shorne@...il.com, James.Bottomley@...senPartnership.com, deller@....de, mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu, paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com, svens@...ux.ibm.com, ysato@...rs.sourceforge.jp, dalias@...c.org, davem@...emloft.net, richard@....at, anton.ivanov@...bridgegreys.com, johannes@...solutions.net, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, acme@...nel.org, mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org, namhyung@...nel.org, jgross@...e.com, srivatsa@...il.mit.edu, amakhalov@...are.com, pv-drivers@...are.com, boris.ostrovsky@...cle.com, chris@...kel.net, jcmvbkbc@...il.com, rafael@...nel.org, lenb@...nel.org, pavel@....cz, gregkh@...uxfoundation.org, mturquette@...libre.com, sboyd@...nel.org, daniel.lezcano@...aro.org, lpieralisi@...nel.org, sudeep.holla@....com, agross@...nel.org, bjorn.andersson@...aro.org, konrad.dybcio@...ainline.org, anup@...infault.org, thierry.reding@...il.com, jonathanh@...dia.com, jacob.jun.pan@...ux.intel.com, atishp@...shpatra.org, Arnd Bergmann <arnd@...db.de>, yury.norov@...il.com, andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk, dennis@...nel.org, tj@...nel.org, cl@...ux.com, rostedt@...dmis.org, pmladek@...e.com, senozhatsky@...omium.org, john.ogness@...utronix.de, juri.lelli@...hat.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com, fweisbec@...il.com, ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com, dvyukov@...gle.com, vincenzo.frascino@....com, Andrew Morton <akpm@...ux-foundation.org>, jpoimboe@...nel.org, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org, linux-snps-arc@...ts.infradead.org, linux-omap@...r.kernel.org, linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org, loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org, openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, linux-um@...ts.infradead.org, linux-perf-users@...r.kernel.org, virtualization@...ts.linux-foundation.org, linux-xtensa@...ux-xtensa.org, linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org, linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-tegra@...r.kernel.org, linux-arch@...r.kernel.org, kasan-dev@...glegroups.com Subject: [PATCH v2 44/44] arm64,riscv,perf: Remove RCU_NONIDLE() usage 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) <peterz@...radead.org> --- 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;
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