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

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(-)