tracing: Turn event/id->i_private into call->event.type
authorOleg Nesterov <oleg@redhat.com>
Fri, 26 Jul 2013 17:25:32 +0000 (19:25 +0200)
committerSteven Rostedt <rostedt@goodmis.org>
Tue, 30 Jul 2013 02:04:30 +0000 (22:04 -0400)
commit1a11126bcb7c93c289bf3218fa546fd3b0c0df8b
treeffbfb4e73894c00bf674ece92c2531505a877a1b
parent5ae90d8e467e625e447000cb4335c4db973b1095
tracing: Turn event/id->i_private into call->event.type

event_id_read() is racy, ftrace_event_call can be already freed
by trace_remove_event_call() callers.

Change event_create_dir() to pass "data = call->event.type", this
is all event_id_read() needs. ftrace_event_id_fops no longer needs
tracing_open_generic().

We add the new helper, event_file_data(), to read ->i_private, it
will have more users.

Note: currently ACCESS_ONCE() and "id != 0" check are not needed,
but we are going to change event_remove/rmdir to clear ->i_private.

Link: http://lkml.kernel.org/r/20130726172532.GA3605@redhat.com
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
kernel/trace/trace_events.c