From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Mon, 21 Jun 2010 08:57:42 +0000 (+0800)
Subject: rcutorture: add random preemption
X-Git-Tag: v2.6.37-rc1~215^2~14^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e546f485e1d7520ca0200502cdcc11b503f4805c;p=pandora-kernel.git

rcutorture: add random preemption

Add random preemption to help we to torture the preemptable rcu.

srcu_read_delay() also calls rcu_read_delay() for shorter delays.

Added comment to preempt_schedule() call indicating that no quiescent
states happen if preemption is disabled.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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