From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 4 Nov 2014 02:15:17 +0000 (-0800)
Subject: rcu: Don't spawn rcub kthreads on root rcu_node structure
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~166^2^2^3~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e9f5c70d85060ff0db71826e2048daffec336e7;p=pandora-kernel.git

rcu: Don't spawn rcub kthreads on root rcu_node structure

Now that offlining CPUs no longer moves leaf rcu_node structures'
->blkd_tasks lists to the root, there is no way for the root rcu_node
structure's ->blkd_task list to be nonempty, unless the root node is also
the sole leaf node.  This commit therefore refrains from creating an rcub
kthread for the root rcu_node structure unless it is also the sole leaf.

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