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| author |   Anna-Maria Gleixner <anna-maria@linutronix.de> | 2016-05-02 10:59:32 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-05-03 09:25:44 +0200 |
| commit | 5bc73539013e93fc44e4d8b1d3557d0ec78df704 (patch) | |
| tree | bfcdd5eb4ad26d767ef2a963b25c96c40dc7c706 /arch/s390/kernel/perf_cpum_cf.c | |
| parent | s390/Kconfig: make z196 the default processor type (diff) | |
| download | linux-dev-5bc73539013e93fc44e4d8b1d3557d0ec78df704.tar.xz linux-dev-5bc73539013e93fc44e4d8b1d3557d0ec78df704.zip | |
s390/cpum_cf: 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 <anna-maria@linutronix.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/perf_cpum_cf.c')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index 62f066b5259e..59215c518f37 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -665,18 +665,21 @@ static struct pmu cpumf_pmu = { static int cpumf_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu) { - unsigned int cpu = (long) hcpu; int flags; switch (action & ~CPU_TASKS_FROZEN) { 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; |