From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 4 Jan 2012 21:30:33 +0000 (-0800)
Subject: rcu: Add lockdep-RCU checks for simple self-deadlock
X-Git-Tag: v3.4-rc1~194^2^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe15d706cfc1cb321dbe2329b04b5ca185edff60;p=pandora-kernel.git

rcu: Add lockdep-RCU checks for simple self-deadlock

It is illegal to have a grace period within a same-flavor RCU read-side
critical section, so this commit adds lockdep-RCU checks to splat when
such abuse is encountered.  This commit does not detect more elaborate
RCU deadlock situations.  These situations might be a job for lockdep
enhancements.

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