diff mbox series

[v3,28/57] perf; Simplify event_sched_in()

Message ID 20230612093539.537454913@infradead.org (mailing list archive)
State New, archived
Headers show
Series Scope-based Resource Management | expand

Commit Message

Peter Zijlstra June 12, 2023, 9:07 a.m. UTC 
Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/events/core.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

Comments

Kees Cook June 13, 2023, 7:43 p.m. UTC | #1 
On Mon, Jun 12, 2023 at 11:07:41AM +0200, Peter Zijlstra wrote:
> Use guards to reduce gotos and simplify control flow.

Typoe in Subject: ";" should be ":"
diff mbox series

Patch

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1153,6 +1153,8 @@  void perf_pmu_enable(struct pmu *pmu)
 		pmu->pmu_enable(pmu);
 }
 
+DEFINE_GUARD(perf_pmu_disable, struct pmu *, perf_pmu_disable(_T), perf_pmu_enable(_T))
+
 static void perf_assert_pmu_disabled(struct pmu *pmu)
 {
 	WARN_ON_ONCE(*this_cpu_ptr(pmu->pmu_disable_count) == 0);
@@ -2489,7 +2491,6 @@  event_sched_in(struct perf_event *event,
 {
 	struct perf_event_pmu_context *epc = event->pmu_ctx;
 	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
-	int ret = 0;
 
 	WARN_ON_ONCE(event->ctx != ctx);
 
@@ -2517,15 +2518,14 @@  event_sched_in(struct perf_event *event,
 		event->hw.interrupts = 0;
 	}
 
-	perf_pmu_disable(event->pmu);
+	guard(perf_pmu_disable)(event->pmu);
 
 	perf_log_itrace_start(event);
 
 	if (event->pmu->add(event, PERF_EF_START)) {
 		perf_event_set_state(event, PERF_EVENT_STATE_INACTIVE);
 		event->oncpu = -1;
-		ret = -EAGAIN;
-		goto out;
+		return -EAGAIN;
 	}
 
 	if (!is_software_event(event))
@@ -2536,10 +2536,7 @@  event_sched_in(struct perf_event *event,
 	if (event->attr.exclusive)
 		cpc->exclusive = 1;
 
-out:
-	perf_pmu_enable(event->pmu);
-
-	return ret;
+	return 0;
 }
 
 static int