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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2008-11-16 05:57:26 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-16 07:55:23 +0100 |
| commit | 1c80025a49855b12fa09bb6db71820e3367b1369 (patch) | |
| tree | 063fe72ed9bb3410c3293c83a7882cecc46e7410 /kernel/trace/trace_functions.c | |
| parent | e6e7a65aabdb696cf05a56cfd495c49a11fd4cde (diff) | |
| download | lwn-1c80025a49855b12fa09bb6db71820e3367b1369.tar.gz lwn-1c80025a49855b12fa09bb6db71820e3367b1369.zip | |
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_functions.c')
| -rw-r--r-- | kernel/trace/trace_functions.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c index 8693b7a0a5b2..e74f6d0a3216 100644 --- a/kernel/trace/trace_functions.c +++ b/kernel/trace/trace_functions.c @@ -42,9 +42,10 @@ static void stop_function_trace(struct trace_array *tr) tracing_stop_cmdline_record(); } -static void function_trace_init(struct trace_array *tr) +static int function_trace_init(struct trace_array *tr) { start_function_trace(tr); + return 0; } static void function_trace_reset(struct trace_array *tr) |