* [PATCH 3/6] tracing: Optimize trace_buffer_iter() logic
@ 2018-07-06 1:06 Steven Rostedt
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From: Steven Rostedt @ 2018-07-06 1:06 UTC (permalink / raw)
To: linux-kernel; +Cc: Linus Torvalds, Ingo Molnar, Andrew Morton, yuan linyu
From: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Simplify and optimize the logic in trace_buffer_iter() to use a conditional
operation instead of an if conditional.
Link: http://lkml.kernel.org/r/20180408113631.3947-1-cugyly@163.com
Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
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 630c5a24b2b2..f8f86231ad90 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -583,9 +583,7 @@ 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);
--
2.17.1
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