From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Fri, 4 May 2012 15:31:53 +0000 (-0700)
Subject: rcu: RCU_FAST_NO_HZ detection of callback adoption
X-Git-Tag: v3.5-rc3~16^2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f5af6f1f2d09fe5eac86a5dc1731a5917c1503a;p=pandora-kernel.git

rcu: RCU_FAST_NO_HZ detection of callback adoption

In the present implementations of CPU hotplug, the outgoing CPU is
guaranteed to run its stop-machine process on the way out, which
will guarantee that RCU_FAST_NO_HZ forces the CPU out of dyntick-idle
mode.

However, new versions of CPU hotplug might not work this way.  This
commit therefore removes this design constraint by explicitly notifying
CPUs when they adopt non-lazy RCU callbacks.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
---

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