From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Fri, 8 Apr 2011 05:47:23 +0000 (-0700)
Subject: rcu: prevent call_rcu() from diving into rcu core if irqs disabled
X-Git-Tag: v3.0-rc1~392^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2655d57ef35aa327a2e58a1c5dc7b65c65003f4e;p=pandora-kernel.git

rcu: prevent call_rcu() from diving into rcu core if irqs disabled

This commit marks a first step towards making call_rcu() have
real-time behavior.  If irqs are disabled, don't dive into the
RCU core.  Later on, this new early exit will wake up the
per-CPU kthread, which first must be modified to handle the
cases involving callback storms.

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