From c7b24d2b9a0f2ce19fdf631d3148c80a8f6010b1 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date: Mon, 28 Jul 2014 14:39:25 -0700
Subject: [PATCH] rcu: Improve RCU-tasks energy efficiency

The current RCU-tasks implementation uses strict polling to detect
callback arrivals.  This works quite well, but is not so good for
energy efficiency.  This commit therefore replaces the strict polling
with a wait queue.

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