From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Thu, 4 Dec 2008 22:47:35 +0000 (+0100)
Subject: tracing/ftrace: don't insert TRACE_PRINT during selftests
X-Git-Tag: v2.6.29-rc1~586^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff32504fdc56407654584ef187b20022c94a3486;p=pandora-kernel.git

tracing/ftrace: don't insert TRACE_PRINT during selftests

Impact: fix tracer selfstests false results

After setting a ftrace_printk somewhere in th kernel, I saw the
Function tracer selftest failing.

When a selftest occurs, the ring buffer is lurked to see if
some entries were inserted. But concurrent insertion such as
ftrace_printk could occured at the same time and could give
false positive or negative results.

This patch prevent prevent from TRACE_PRINT entries insertion
during selftests.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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