On Fri, Dec 02, 2016 at 12:56:01PM -0600, Jeremy Linton wrote: > ACPI CPUs aren't associated with a PMU until they have been put > online. This means that we potentially have to update a PMU > definition the first time a CPU is hot added to the machine. > > Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx> > --- > drivers/perf/arm_pmu.c | 38 ++++++++++++++++++++++++++++++++++++-- > include/linux/perf/arm_pmu.h | 4 ++++ > 2 files changed, 40 insertions(+), 2 deletions(-) > > diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c > index fa40294..4abb2fe 100644 > --- a/drivers/perf/arm_pmu.c > +++ b/drivers/perf/arm_pmu.c > @@ -711,6 +711,30 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) > return 0; > } > > +static DEFINE_SPINLOCK(arm_pmu_resource_lock); Why do you need this spinlock? The hotplug notifiers are serialised afaik, and you don't take it anywhere else. Will -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
