From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 12 Aug 2014 18:27:31 +0000 (-0700)
Subject: rcu: Handle NOCB callbacks from irq-disabled idle code
X-Git-Tag: omap-for-v3.19/prcm-cleanup~100^2~1^2~16^3~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1772947bd0126661866069157e95197e9c0020e9;p=pandora-kernel.git

rcu: Handle NOCB callbacks from irq-disabled idle code

If an RCU callback is queued on a no-CBs CPU from idle code with irqs
disabled, and if that CPU stays idle forever after, the callback will
never be invoked.  This commit therefore adds a check for this situation
in ____call_rcu_nocb(), invoking the RCU core solely for the purpose
of the ensuing return-to-idle transition.  (If the CPU doesn't return
to idle, the next scheduling-clock interrupt will fix things up.)

Reported-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---

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