From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Wed, 23 May 2012 05:10:24 +0000 (-0700)
Subject: rcu: Make __call_rcu() handle invocation from idle
X-Git-Tag: v3.6-rc1~168^2^2~2^3~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=62fde6edf12b60fddb13a3f0a779c8be0bb7447e;p=pandora-kernel.git

rcu: Make __call_rcu() handle invocation from idle

Although __call_rcu() is handled correctly when called from a momentary
non-idle period, if it is called on a CPU that RCU believes to be idle
on RCU_FAST_NO_HZ kernels, the callback might be indefinitely postponed.
This commit therefore ensures that RCU is aware of the new callback and
has a chance to force the CPU out of dyntick-idle mode when a new callback
is posted.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

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