[PATCH v4 0/3] tracing/user_events: Fix incorrect return value for writes when events are disabled and add its tests

[sunliming]

Now the writing operation return the count of writes regardless of whether
events are enabled or disabled. Fix this by just return -EBADF when events
are disabled.

v3 -> v4:
- Change the return value from zero to -EBADF

v2 -> v3:
- Change the return value from -ENOENT to zero

v1 -> v2:
- Change the return value from -EFAULT to -ENOENT

sunliming (3):
  tracing/user_events: Fix incorrect return value for writing operation
    when events are disabled
  selftests/user_events: Enable the event before write_fault test in
    ftrace self-test
  selftests/user_events: Add test cases when event is disabled

 kernel/trace/trace_events_user.c                  | 3 ++-
 tools/testing/selftests/user_events/ftrace_test.c | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

-- 
2.25.1