diff options
| 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.h | |
| parent | e6e7a65aabdb696cf05a56cfd495c49a11fd4cde (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.h')
| -rw-r--r-- | kernel/trace/trace.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 790ea8c0e1f..cdbd5cc22be 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -264,7 +264,8 @@ enum print_line_t { */ struct tracer { const char *name; - void (*init)(struct trace_array *tr); + /* Your tracer should raise a warning if init fails */ + int (*init)(struct trace_array *tr); void (*reset)(struct trace_array *tr); void (*start)(struct trace_array *tr); void (*stop)(struct trace_array *tr); |