tree 841e01c8d64fdf08b88c8a76de3272b4630ed145
parent cb59974742aea24adf6637eb0c4b8e7b48bca6fb
author Li Zefan <lizf@cn.fujitsu.com> 1320109775 +0800
committer Steven Rostedt <rostedt@goodmis.org> 1323109725 -0500

tracing: Restore system filter behavior

Though not all events have field 'prev_pid', it was allowed to do this:

  # echo 'prev_pid == 100' > events/sched/filter

but commit 75b8e98263fdb0bfbdeba60d4db463259f1fe8a2 (tracing/filter: Swap
entire filter of events) broke it without any reason.

Link: http://lkml.kernel.org/r/4EAF46CF.8040408@cn.fujitsu.com

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>