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Subject[PATCH v2 4/9] perf/x86: Add a x86_pmu::limit_period static_call
Avoid a branch and indirect call.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/events/core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -72,8 +72,9 @@ DEFINE_STATIC_CALL_NULL(x86_pmu_add, *x
DEFINE_STATIC_CALL_NULL(x86_pmu_del, *x86_pmu.del);
DEFINE_STATIC_CALL_NULL(x86_pmu_read, *x86_pmu.read);

-DEFINE_STATIC_CALL_NULL(x86_pmu_set_period, *x86_pmu.set_period);
-DEFINE_STATIC_CALL_NULL(x86_pmu_update, *x86_pmu.update);
+DEFINE_STATIC_CALL_NULL(x86_pmu_set_period, *x86_pmu.set_period);
+DEFINE_STATIC_CALL_NULL(x86_pmu_update, *x86_pmu.update);
+DEFINE_STATIC_CALL_NULL(x86_pmu_limit_period, *x86_pmu.limit_period);

DEFINE_STATIC_CALL_NULL(x86_pmu_schedule_events, *x86_pmu.schedule_events);
DEFINE_STATIC_CALL_NULL(x86_pmu_get_event_constraints, *x86_pmu.get_event_constraints);
@@ -1391,8 +1392,7 @@ int x86_perf_event_set_period(struct per
if (left > x86_pmu.max_period)
left = x86_pmu.max_period;

- if (x86_pmu.limit_period)
- x86_pmu.limit_period(event, &left);
+ static_call_cond(x86_pmu_limit_period)(event, &left);

this_cpu_write(pmc_prev_left[idx], left);

@@ -2017,6 +2017,7 @@ static void x86_pmu_static_call_update(v

static_call_update(x86_pmu_set_period, x86_pmu.set_period);
static_call_update(x86_pmu_update, x86_pmu.update);
+ static_call_update(x86_pmu_limit_period, x86_pmu.limit_period);

static_call_update(x86_pmu_schedule_events, x86_pmu.schedule_events);
static_call_update(x86_pmu_get_event_constraints, x86_pmu.get_event_constraints);

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