From: Anna-Maria Gleixner Date: Mon, 2 May 2016 09:00:12 +0000 (+0200) Subject: s390/cpum_sf: Remove superfluous SMP function call X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e18eb2d1eb03fa06ccb7823a44d7ceea621e2bbb;p=linux-beck.git s390/cpum_sf: Remove superfluous SMP function call Since commit 3b9d6da67e11 ("cpu/hotplug: Fix rollback during error-out in __cpu_disable()") it is ensured that callbacks of CPU_ONLINE and CPU_DOWN_PREPARE are processed on the hotplugged CPU. Due to this SMP function calls are no longer required. Replace smp_call_function_single() with a direct call of setup_pmc_cpu(). To keep the calling convention, interrupts are explicitly disabled around the call. Cc: linux-s390@vger.kernel.org Signed-off-by: Anna-Maria Gleixner Acked-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index eaab9a7cb3be..a8e832166417 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1510,7 +1510,6 @@ static void cpumf_measurement_alert(struct ext_code ext_code, static int cpumf_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu) { - unsigned int cpu = (long) hcpu; int flags; /* Ignore the notification if no events are scheduled on the PMU. @@ -1523,11 +1522,15 @@ static int cpumf_pmu_notifier(struct notifier_block *self, case CPU_ONLINE: case CPU_DOWN_FAILED: flags = PMC_INIT; - smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); + local_irq_disable(); + setup_pmc_cpu(&flags); + local_irq_enable(); break; case CPU_DOWN_PREPARE: flags = PMC_RELEASE; - smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); + local_irq_disable(); + setup_pmc_cpu(&flags); + local_irq_enable(); break; default: break;