From a82dcc76021e22c174ba85d90b7a8c750b7362d0 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paul.mckenney@linaro.org>
Date: Wed, 1 Aug 2012 14:29:20 -0700
Subject: [PATCH] rcu: Make offline-CPU checking allow for indefinite delays

The rcu_implicit_offline_qs() function implicitly assumed that execution
would progress predictably when interrupts are disabled, which is of course
not guaranteed when running on a hypervisor.  Furthermore, this function
is short, and is called from one place only in a short function.

This commit therefore ensures that the timing is checked before
checking the condition, which guarantees correct behavior even given
indefinite delays.  It also inlines rcu_implicit_offline_qs() into
rcu_implicit_dynticks_qs().

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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