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authorFrederic Weisbecker <fweisbec@gmail.com>2008-11-15 23:57:26 -0500
committerIngo Molnar <mingo@elte.hu>2008-11-16 01:55:23 -0500
commit1c80025a49855b12fa09bb6db71820e3367b1369 (patch)
tree063fe72ed9bb3410c3293c83a7882cecc46e7410 /kernel/trace/trace_sched_wakeup.c
parente6e7a65aabdb696cf05a56cfd495c49a11fd4cde (diff)
tracing/ftrace: change the type of the init() callback
Impact: extend the ->init() method with the ability to fail This bring a way to know if the initialization of a tracer successed. A tracer must return 0 on success and a traditional error (ie: -ENOMEM) if it fails. If a tracer fails to init, it is free to print a detailed warn. The tracing api will not and switch to a new tracer will just return the error from the init callback. Note: this will be used for the return tracer. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_sched_wakeup.c')
-rw-r--r--kernel/trace/trace_sched_wakeup.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 983f2b1478c9..0067b49746c1 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -331,10 +331,11 @@ static void stop_wakeup_tracer(struct trace_array *tr)
331 unregister_trace_sched_wakeup(probe_wakeup); 331 unregister_trace_sched_wakeup(probe_wakeup);
332} 332}
333 333
334static void wakeup_tracer_init(struct trace_array *tr) 334static int wakeup_tracer_init(struct trace_array *tr)
335{ 335{
336 wakeup_trace = tr; 336 wakeup_trace = tr;
337 start_wakeup_tracer(tr); 337 start_wakeup_tracer(tr);
338 return 0;
338} 339}
339 340
340static void wakeup_tracer_reset(struct trace_array *tr) 341static void wakeup_tracer_reset(struct trace_array *tr)