From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Sun, 14 Aug 2011 22:56:54 +0000 (-0700)
Subject: rcu: Avoid having just-onlined CPU resched itself when RCU is idle
X-Git-Tag: v3.2-rc1~165^2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06ae115a1d551cd952d80df06eaf8b5153351875;p=pandora-kernel.git

rcu: Avoid having just-onlined CPU resched itself when RCU is idle

CPUs set rdp->qs_pending when coming online to resolve races with
grace-period start.  However, this means that if RCU is idle, the
just-onlined CPU might needlessly send itself resched IPIs.  Adjust
the online-CPU initialization to avoid this, and also to correctly
cause the CPU to respond to the current grace period if needed.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Josh Boyer <jwboyer@redhat.com>
Tested-by: Christian Hoffmann <email@christianhoffmann.info>
---

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