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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-03-19 20:26:14 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-20 10:17:06 +0100 |
| commit | 28bea271e58e429eccfad3d7ee2ad12d6ee015bf (patch) | |
| tree | 00b5cf70bf147e7fad3b438835d21b093a2b9c28 /kernel | |
| parent | 23725aeeab10ba02bcf10ec49ad73146b54cb52f (diff) | |
| download | linux-28bea271e58e429eccfad3d7ee2ad12d6ee015bf.tar.gz linux-28bea271e58e429eccfad3d7ee2ad12d6ee015bf.tar.xz | |
ftrace: ensure every event gets an id
Impact: widen user-space visibe event IDs to all events
Previously only TRACE_EVENT events got ids, because only they
generated raw output which needs to be demuxed from the trace.
In order to provide a unique ID for each event, register everybody,
regardless.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20090319194233.464914218@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_events_stage_3.h | 15 | ||||
| -rw-r--r-- | kernel/trace/trace_output.c | 5 |
2 files changed, 19 insertions, 1 deletions
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h index ae2e323df0c7..4c26d97b4508 100644 --- a/kernel/trace/trace_events_stage_3.h +++ b/kernel/trace/trace_events_stage_3.h @@ -130,7 +130,19 @@ static void ftrace_unreg_event_##call(void) \ { \ unregister_trace_##call(ftrace_event_##call); \ } \ - + \ +static struct ftrace_event_call event_##call; \ + \ +static int ftrace_init_event_##call(void) \ +{ \ + int id; \ + \ + id = register_ftrace_event(NULL); \ + if (!id) \ + return -ENODEV; \ + event_##call.id = id; \ + return 0; \ +} #undef TRACE_FORMAT #define TRACE_FORMAT(call, proto, args, fmt) \ @@ -140,6 +152,7 @@ __attribute__((__aligned__(4))) \ __attribute__((section("_ftrace_events"))) event_##call = { \ .name = #call, \ .system = __stringify(TRACE_SYSTEM), \ + .raw_init = ftrace_init_event_##call, \ .regfunc = ftrace_reg_event_##call, \ .unregfunc = ftrace_unreg_event_##call, \ } diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index b45141748af5..19261fdd2455 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -481,6 +481,11 @@ int register_ftrace_event(struct trace_event *event) mutex_lock(&trace_event_mutex); + if (!event) { + ret = next_event_type++; + goto out; + } + if (!event->type) event->type = next_event_type++; else if (event->type > __TRACE_LAST_TYPE) { |