From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Thu, 2 Feb 2012 23:42:04 +0000 (-0800)
Subject: rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections
X-Git-Tag: v3.4-rc1~194^2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a2ecf474d3ee8dd5d001490349e422cec52f39f;p=pandora-kernel.git

rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections

RCU, RCU-bh, and RCU-sched read-side critical sections are forbidden
in the inner idle loop, that is, between the rcu_idle_enter() and the
rcu_idle_exit() -- RCU will happily ignore any such read-side critical
sections.  However, things like powertop need tracepoints in the inner
idle loop.

This commit therefore provides an RCU_NONIDLE() macro that can be used to
wrap code in the idle loop that requires RCU read-side critical sections.

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
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>
Acked-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
---

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