From: Zhaolei <zhaolei@cn.fujitsu.com>
Date: Wed, 25 Mar 2009 04:06:05 +0000 (+0800)
Subject: ftrace: Using FTRACE_WARN_ON() to check "freed record" in ftrace_release()
X-Git-Tag: v2.6.30-rc1~2^2~13^3~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a4efa42450762cbfa5c5712aa4cc9f06924c9fd;p=pandora-kernel.git

ftrace: Using FTRACE_WARN_ON() to check "freed record" in ftrace_release()

 "Because when we call ftrace_free_rec we change the rec->ip to point to the
  next record in the chain. Something is very wrong if rec->ip >= s &&
  rec->ip < e and the record is already free."

 "Note, use FTRACE_WARN_ON() macro. This way it shuts down ftrace if it is
  hit and helps to avoid further damage later."
                   -- Steven Rostedt <rostedt@goodmis.org>

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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