From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 12 May 2008 19:20:56 +0000 (+0200)
Subject: ftrace: selftest protect againt max flip
X-Git-Tag: v2.6.27-rc1~1102^2^2~1^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30afdcb1de0a37a2086145a82ca3febebe47d019;p=pandora-kernel.git

ftrace: selftest protect againt max flip

There is a slight race condition in the selftest where the max update
of the wakeup and irqs/preemption off tests can be doing a max update as
the buffers are being tested. If this happens the system can crash with
a GPF.

This patch adds the max update spinlock around the checking of the
buffers to prevent such a race.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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