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 <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: [email protected] Signed-off-by: Anna-Maria Gleixner <[email protected]> --- arch/s390/kernel/perf_cpum_cf.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- 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;
