linux-kernel - [PATCH for-next v2] tracing: optimize trace_buffer

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Date:   Sun,  8 Apr 2018 19:36:31 +0800
From:   yuan linyu <cugyly@....com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
Subject: [PATCH for-next v2] tracing: optimize trace_buffer_iter()

From: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>

use conditional operation.

Signed-off-by: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
---
 kernel/trace/trace.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 6fb46a06c9dc..bda717ab2095 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -582,9 +582,7 @@ static __always_inline void trace_clear_recursion(int bit)
 static inline struct ring_buffer_iter *
 trace_buffer_iter(struct trace_iterator *iter, int cpu)
 {
-	if (iter->buffer_iter && iter->buffer_iter[cpu])
-		return iter->buffer_iter[cpu];
-	return NULL;
+	return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
 }
 
 int tracer_init(struct tracer *t, struct trace_array *tr);
-- 
2.14.1