From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Fri, 13 Feb 2015 18:52:28 +0000 (-0800)
Subject: rcu: Rework preemptible expedited bitmask handling
X-Git-Tag: omap-for-v4.2/o2_dc~148^2~2^2^5~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8eb74b2b291e7bf6aa59fcb4e59f236382f00bf5;p=pandora-kernel.git

rcu: Rework preemptible expedited bitmask handling

Currently, the rcu_node tree ->expmask bitmasks are initially set to
reflect the online CPUs.  This is pointless, because only the CPUs
preempted within RCU read-side critical sections by the preceding
synchronize_sched_expedited() need to be tracked.  This commit therefore
instead sets up these bitmasks based on the state of the ->blkd_tasks
lists.

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