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s390/cpum_sf: Remove superfluous SMP function call 

Since commit 3b9d6da67e ("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 <anna-maria@linutronix.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Anna-Maria Gleixner 2016-05-02 11:00:12 +02:00 committed by Martin Schwidefsky
parent 5bc7353901
commit e18eb2d1eb
1 changed files with 6 additions and 3 deletions
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9
arch/s390/kernel/perf_cpum_sf.c
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@ -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;