From: Steven Rostedt <rostedt@goodmis.org>
Date: Tue, 15 Jul 2008 13:53:37 +0000 (-0400)
Subject: ftrace: only trace preempt off with preempt tracer
X-Git-Tag: v2.6.27-rc1~81^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e01cb0c6ff7e9ddb6547551794c6aa82785a7cb;p=pandora-kernel.git

ftrace: only trace preempt off with preempt tracer

When PREEMPT_TRACER and IRQSOFF_TRACER are both configured and irqsoff
tracer is running, the preempt_off sections might also be traced.

Thanks to Andrew Morton for pointing out my mistake of spin_lock disabling
interrupts while he was reviewing ftrace.txt. Seems that my example I used
actually hit this bug.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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