From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Thu, 22 Jan 2015 22:32:06 +0000 (-0800)
Subject: rcu: Detect stalls caused by failure to propagate up rcu_node tree
X-Git-Tag: omap-for-v4.2/o2_dc~148^2~2^2^5~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=237a0f2193c6daf9b1edd7fd15d55e680f268952;p=pandora-kernel.git

rcu: Detect stalls caused by failure to propagate up rcu_node tree

If all CPUs have passed through quiescent states, then stalls might be
due to starvation of the grace-period kthread or to failure to propagate
the quiescent states up the rcu_node combining tree.  The current stall
warning messages do not differentiate, so this commit adds a printout
of the root rcu_node structure's ->qsmask field.

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