From: Abhishek Sagar <sagar.abhishek@gmail.com>
Date: Sun, 1 Jun 2008 16:17:30 +0000 (+0530)
Subject: ftrace: prevent freeing of all failed updates
X-Git-Tag: v2.6.27-rc1~1102^2^2~3^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0eb967012ea15e6e8cfab483d9fa37bc602d400c;p=pandora-kernel.git

ftrace: prevent freeing of all failed updates

Prevent freeing of records which cause problems and correspond to function from
core kernel text. A new flag, FTRACE_FL_CONVERTED is used to mark a record
as "converted". All other records are patched lazily to NOPs. Failed records
now also remain on frace_hash table. Each invocation of ftrace_record_ip now
checks whether the traced function has ever been recorded (including past
failures) and doesn't re-record it again.

Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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