From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Tue, 16 Dec 2008 21:08:58 +0000 (+0100)
Subject: tracing/ftrace: use preempt_enable_no_resched_notrace in ring_buffer_time_stamp()
X-Git-Tag: v2.6.29-rc1~586^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c2d7329d8afa9efa3ec24e19a53e7be9d14f242;p=pandora-kernel.git

tracing/ftrace: use preempt_enable_no_resched_notrace in ring_buffer_time_stamp()

Impact: prevent a trace recursion

After some tests with function graph tracer under x86-32, I saw some recursions
caused by ring_buffer_time_stamp() that calls preempt_enable_no_notrace() which
calls preempt_schedule() which is traced itself.

This patch re-enables preemption without rescheduling.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

Reading git-diff-tree failed