tracing/function: Avoid perf_trace_buf_*() if event_function.perf_events is empty

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perf_trace_buf_prepare() + perf_trace_buf_submit(head, task => NULL)
make no sense if hlist_empty(head). Change perf_ftrace_function_call()
to check event_function.perf_events beforehand.

Link: http://lkml.kernel.org/r/20130617170204.GA19803@redhat.com

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Oleg Nesterov 2013-06-17 19:02:04 +02:00 • committed by Steven Rostedt

parent d611851b42

commit b8ebfd3f71

1 changed files with 4 additions and 2 deletions

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kernel/trace/trace_event_perf.c

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