From: Li Zefan <lizf@cn.fujitsu.com>
Date: Tue, 1 Nov 2011 01:09:35 +0000 (+0800)
Subject: tracing: Restore system filter behavior
X-Git-Tag: v3.2-rc5~39^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27b14b56af081ec7edeefb3a38b2c9577cc5ef48;p=pandora-kernel.git

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>
---

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