diff options
Diffstat (limited to 'kernel/kernel/trace/trace_events.c')
| -rw-r--r-- | kernel/kernel/trace/trace_events.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/kernel/kernel/trace/trace_events.c b/kernel/kernel/trace/trace_events.c index 0e508e99b..5bd79b347 100644 --- a/kernel/kernel/trace/trace_events.c +++ b/kernel/kernel/trace/trace_events.c @@ -246,6 +246,14 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, local_save_flags(fbuffer->flags); fbuffer->pc = preempt_count(); + /* + * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables + * preemption (adding one to the preempt_count). Since we are + * interested in the preempt_count at the time the tracepoint was + * hit, we need to subtract one to offset the increment. + */ + if (IS_ENABLED(CONFIG_PREEMPT)) + fbuffer->pc--; fbuffer->trace_file = trace_file; fbuffer->event = @@ -2109,8 +2117,13 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file) trace_create_file("filter", 0644, file->dir, file, &ftrace_event_filter_fops); - trace_create_file("trigger", 0644, file->dir, file, - &event_trigger_fops); + /* + * Only event directories that can be enabled should have + * triggers. + */ + if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) + trace_create_file("trigger", 0644, file->dir, file, + &event_trigger_fops); trace_create_file("format", 0444, file->dir, call, &ftrace_event_format_fops); |