metag, perf: Use common PMU interrupt disabled code
Transition to using the new generic PERF_PMU_CAP_NO_INTERRUPT method for
failing a sampling event when no PMU interrupt is available.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linux-metag@vger.kernel.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1406150202050.16738@vincent-weaver-1.umelst.maine.edu
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c
index 5cc4d4d..02c0873 100644
--- a/arch/metag/kernel/perf/perf_event.c
+++ b/arch/metag/kernel/perf/perf_event.c
@@ -568,16 +568,6 @@
return -EINVAL;
/*
- * Early cores have "limited" counters - they have no overflow
- * interrupts - and so are unable to do sampling without extra work
- * and timer assistance.
- */
- if (metag_pmu->max_period == 0) {
- if (hwc->sample_period)
- return -EINVAL;
- }
-
- /*
* Don't assign an index until the event is placed into the hardware.
* -1 signifies that we're still deciding where to put it. On SMP
* systems each core has its own set of counters, so we can't do any
@@ -866,6 +856,15 @@
pr_info("enabled with %s PMU driver, %d counters available\n",
metag_pmu->name, metag_pmu->max_events);
+ /*
+ * Early cores have "limited" counters - they have no overflow
+ * interrupts - and so are unable to do sampling without extra work
+ * and timer assistance.
+ */
+ if (metag_pmu->max_period == 0) {
+ metag_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
+ }
+
/* Initialise the active events and reservation mutex */
atomic_set(&metag_pmu->active_events, 0);
mutex_init(&metag_pmu->reserve_mutex);
