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. Also, reduces the stack usage. This code was detected with the help of Coccinelle. Link: http://lkml.kernel.org/r/20180209175316.GA18720@embeddedgus Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -1360,8 +1360,6 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
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void
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update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
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{
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struct ring_buffer *buf;
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if (tr->stop_count)
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return;
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@ -1375,9 +1373,7 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
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arch_spin_lock(&tr->max_lock);
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buf = tr->trace_buffer.buffer;
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tr->trace_buffer.buffer = tr->max_buffer.buffer;
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tr->max_buffer.buffer = buf;
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swap(tr->trace_buffer.buffer, tr->max_buffer.buffer);
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__update_max_tr(tr, tsk, cpu);
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arch_spin_unlock(&tr->max_lock);
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