linux-kernel - [PATCH] tracing: use swap macro in update_max

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Date:   Fri, 3 Nov 2017 16:08:31 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] tracing: use swap macro in update_max_tr

Make use of the swap macro and remove unnecessary variable buf.
This makes the code easier to read and maintain.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 kernel/trace/trace.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index dbce1be..1bca7fb 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1351,8 +1351,6 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 void
 update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 {
-	struct ring_buffer *buf;
-
 	if (tr->stop_count)
 		return;
 
@@ -1365,11 +1363,7 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 	}
 
 	arch_spin_lock(&tr->max_lock);
-
-	buf = tr->trace_buffer.buffer;
-	tr->trace_buffer.buffer = tr->max_buffer.buffer;
-	tr->max_buffer.buffer = buf;
-
+	swap(tr->trace_buffer.buffer, tr->max_buffer.buffer);
 	__update_max_tr(tr, tsk, cpu);
 	arch_spin_unlock(&tr->max_lock);
 }
-- 
2.7.4