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| author | Peter Zijlstra <peterz@infradead.org> | 2009-08-05 20:41:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-06 06:26:09 +0200 |
| commit | af6af30c0fcd77e621638e53ef8b176bca8bd3b4 (patch) | |
| tree | fde3faf7cc117e208dd033eee707dbd9de5f912e | |
| parent | 386c0b702b1ea81c0f54f5c9832a3d4a52270f14 (diff) | |
| download | lwn-af6af30c0fcd77e621638e53ef8b176bca8bd3b4.tar.gz lwn-af6af30c0fcd77e621638e53ef8b176bca8bd3b4.zip | |
ftrace: Fix perf-tracepoint OOPS
Not all tracepoints are created equal, in specific the ftrace
tracepoints are created with TRACE_EVENT_FORMAT() which does
not generate the needed bits to tie them into perf counters.
For those events, don't create the 'id' file and fail
->profile_enable when their ID is specified through other
means.
Reported-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1249497664.5890.4.camel@laptop>
[ v2: fix build error in the !CONFIG_EVENT_PROFILE case ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/ftrace_event.h | 8 | ||||
| -rw-r--r-- | kernel/trace/trace_event_profile.c | 2 | ||||
| -rw-r--r-- | kernel/trace/trace_events.c | 2 |
3 files changed, 5 insertions, 7 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index 5c093ffc655b..d7cd193c2277 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -119,11 +119,9 @@ struct ftrace_event_call { void *filter; void *mod; -#ifdef CONFIG_EVENT_PROFILE - atomic_t profile_count; - int (*profile_enable)(struct ftrace_event_call *); - void (*profile_disable)(struct ftrace_event_call *); -#endif + atomic_t profile_count; + int (*profile_enable)(struct ftrace_event_call *); + void (*profile_disable)(struct ftrace_event_call *); }; #define MAX_FILTER_PRED 32 diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c index 5b5895afecfe..11ba5bb4ed0a 100644 --- a/kernel/trace/trace_event_profile.c +++ b/kernel/trace/trace_event_profile.c @@ -14,7 +14,7 @@ int ftrace_profile_enable(int event_id) mutex_lock(&event_mutex); list_for_each_entry(event, &ftrace_events, list) { - if (event->id == event_id) { + if (event->id == event_id && event->profile_enable) { ret = event->profile_enable(event); break; } diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 23d2972b22d6..e75276a49cf5 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -940,7 +940,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, entry = trace_create_file("enable", 0644, call->dir, call, enable); - if (call->id) + if (call->id && call->profile_enable) entry = trace_create_file("id", 0444, call->dir, call, id); |