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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>
This commit is contained in:
Gustavo A. R. Silva 2018-02-09 11:53:16 -06:00 committed by Steven Rostedt (VMware)
parent 1a63dcd876
commit 08ae88f810
1 changed files with 1 additions and 5 deletions
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6
kernel/trace/trace.c
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@ -1360,8 +1360,6 @@ __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;
@ -1375,9 +1373,7 @@ 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);