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Groups > linux.kernel > #1370527

[PATCH] s390/cpum_sf: Remove superfluous SMP function call

From Anna-Maria Gleixner <anna-maria@linutronix.de>
Newsgroups linux.kernel
Subject [PATCH] s390/cpum_sf: Remove superfluous SMP function call
Date 2016-04-04 12:30 +0200
Message-ID <rk9VG-1Ap-53@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

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Since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to
hotplugged cpu") 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
explicitely disabled around the call.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
---
 arch/s390/kernel/perf_cpum_sf.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- 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(stru
 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 not
 	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;

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Thread

[PATCH] s390/cpum_sf: Remove superfluous SMP function call Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-04-04 12:30 +0200
  Re: [PATCH] s390/cpum_sf: Remove superfluous SMP function call Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-05 12:50 +0200
    Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Sebastian Andrzej Siewior <sebastian.siewior@linutronix.de> - 2016-04-05 13:20 +0200
      Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-05 13:30 +0200
        Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-05 13:40 +0200
          Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-05 14:00 +0200
          Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call rcochran@linutronix.de - 2016-04-05 14:00 +0200
            Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Sebastian Andrzej Siewior <sebastian.siewior@linutronix.de> - 2016-04-05 14:00 +0200
              Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP  function call Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-05 14:20 +0200
                Re: [PATCH] s390/cpum_sf: Remove superfluous SMP function call Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-05 14:20 +0200
                [PATCH] cpu/hotplug: fix rollback during error-out in __cpu_disable() Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-05 18:00 +0200
                Re: [PATCH] cpu/hotplug: fix rollback during error-out in  __cpu_disable() Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-06 22:00 +0200
                Re: [PATCH] cpu/hotplug: fix rollback during error-out in  __cpu_disable() Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-07 17:20 +0200
                Re: [PATCH] cpu/hotplug: fix rollback during error-out in  __cpu_disable() Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-04-08 08:30 +0200
                [PATCH v2] cpu/hotplug: fix rollback during error-out in  __cpu_disable() Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-08 14:50 +0200

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