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tracing: Fix output of top level event "enable" file 

When writing a tool for enabling events in the tracing system,
 an anomaly was discovered. The top level event "enable" file would
 never show "1" when all events were enabled. The system and event
 "enable" files worked as expected. The reason was because the top
 level event "enable" file included the "ftrace" tracer events,
 which are not controlled by the "enable" file and would cause the
 output to be wrong. This appears to have been a bug since it was created.
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Merge tag 'trace-v5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "Fix output of top level event tracing 'enable' file.

  When writing a tool for enabling events in the tracing system, an
  anomaly was discovered. The top level event 'enable' file would never
  show '1' when all events were enabled.

  The system and event 'enable' files worked as expected.

  The reason was because the top level event 'enable' file included the
  'ftrace' tracer events, which are not controlled by the 'enable' file
  and would cause the output to be wrong. This appears to have been a
  bug since it was created"

* tag 'trace-v5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Do not count ftrace events in top level enable output
This commit is contained in:
Linus Torvalds 2021-02-08 11:32:39 -08:00
parent 92bf22614b 256cfdd6fd
commit e0756cfc7d
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_events.c
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@ -1212,7 +1212,8 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
mutex_lock(&event_mutex);
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
if (!trace_event_name(call) || !call->class || !call->class->reg)
if ((call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) ||
!trace_event_name(call) || !call->class || !call->class->reg)
continue;
if (system && strcmp(call->class->system, system->name) != 0)