linux-kernel - [PATCH v3 41/57] perf: Simplify __perf_event

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Message-ID: <20230612093540.493651920@infradead.org>
Date:   Mon, 12 Jun 2023 11:07:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     torvalds@...ux-foundation.org, keescook@...omium.org,
        gregkh@...uxfoundation.org, pbonzini@...hat.com
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Subject: [PATCH v3 41/57] perf: Simplify __perf_event_output()


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7739,22 +7739,17 @@ __perf_event_output(struct perf_event *e
 	int err;
 
 	/* protect the callchain buffers */
-	rcu_read_lock();
+	guard(rcu)();
 
 	perf_prepare_sample(data, event, regs);
 	perf_prepare_header(&header, data, event, regs);
-
 	err = output_begin(&handle, data, event, header.size);
 	if (err)
-		goto exit;
-
+		return err;
 	perf_output_sample(&handle, &header, data, event);
-
 	perf_output_end(&handle);
 
-exit:
-	rcu_read_unlock();
-	return err;
+	return 0;
 }
 
 void