From: Kirill Tkhai <tkhai@yandex.ru>
Date: Sun, 15 Sep 2013 13:29:17 +0000 (+0400)
Subject: rcu: Fix CONFIG_RCU_NOCB_CPU_ALL panic on machines with sparse CPU mask
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~44^2^2~3^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d5a08003d3e678372e375d99c65a24e0d33d2f5;p=pandora-kernel.git

rcu: Fix CONFIG_RCU_NOCB_CPU_ALL panic on machines with sparse CPU mask

Some architectures have sparse cpu mask. UltraSparc's cpuinfo for example:

CPU0: online
CPU2: online

So, set only possible CPUs when CONFIG_RCU_NOCB_CPU_ALL is enabled.

Also, check that user passes right 'rcu_nocbs=' option.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: Dipankar Sarma <dipankar@in.ibm.com>
[ paulmck: Fix pr_info() issue noted by scripts/checkpatch.pl. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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