tree 866c4d195207ac37d4477f9ce09d429085532180
parent d15f57f23eaba975309a153b23699cd0c0236974
author Steven Rostedt <rostedt@goodmis.org> 1210620056 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1211570159 +0200

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>