From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 14 Aug 2013 23:24:26 +0000 (-0700)
Subject: rcu: Add tracing for rcuo no-CBs CPU wakeup handshake
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~44^2^2~2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9261dd0da6c6432f08670719069449c6efe4f7a9;p=pandora-kernel.git

rcu: Add tracing for rcuo no-CBs CPU wakeup handshake

Lost wakeups from call_rcu() to the rcuo kthreads can result in hangs
that are difficult to diagnose.  This commit therefore adds tracing to
help pin down the cause of these hangs.

Reported-by: Clark Williams <williams@redhat.com>
Reported-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Add const per kbuild test robot's advice. ]
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