From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Thu, 4 Aug 2011 13:59:03 +0000 (-0700)
Subject: rcu: Prevent early boot set_need_resched() from __rcu_pending()
X-Git-Tag: v3.2-rc1~165^2^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c51dd7349d4bb26f845f17f85daa168f5fa03f2;p=pandora-kernel.git

rcu: Prevent early boot set_need_resched() from __rcu_pending()

There isn't a whole lot of point in poking the scheduler before there
are other tasks to switch to.  This commit therefore adds a check
for rcu_scheduler_fully_active in __rcu_pending() to suppress any
pre-scheduler calls to set_need_resched().  The downside of this approach
is additional runtime overhead in a reasonably hot code path.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

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