Messages in this thread Patch in this message | | | Date | Fri, 20 Mar 2009 10:19:38 GMT | From | Peter Zijlstra <> | Subject | [tip:tracing/ftrace] ftrace: ensure every event gets an id |
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Commit-ID: 28bea271e58e429eccfad3d7ee2ad12d6ee015bf Gitweb: http://git.kernel.org/tip/28bea271e58e429eccfad3d7ee2ad12d6ee015bf Author: Peter Zijlstra <a.p.zijlstra@chello.nl> AuthorDate: Thu, 19 Mar 2009 20:26:14 +0100 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Fri, 20 Mar 2009 10:17:06 +0100
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>
--- kernel/trace/trace_events_stage_3.h | 15 ++++++++++++++- 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 ae2e323..4c26d97 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 b451417..19261fd 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) {
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