From: Paul E. McKenney Date: Wed, 16 Jul 2014 14:37:06 +0000 (-0700) Subject: rcu: Allow for NULL tick_nohz_full_mask when nohz_full= missing X-Git-Tag: omap-for-v3.17/fixes-against-rc2~180^2^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=187497fa5e9e9383820d33e48b87f8200a747c2a;p=pandora-kernel.git rcu: Allow for NULL tick_nohz_full_mask when nohz_full= missing If there isn't a nohz_full= kernel parameter specified, then tick_nohz_full_mask can legitimately be NULL. This can cause problems when RCU's boot code tries to cpumask_or() this value into rcu_nocb_mask. In addition, if NO_HZ_FULL_ALL=y, there is no point in doing the cpumask_or() in the first place because this will cause RCU_NOCB_CPU_ALL=y, which in turn will have all bits already set in rcu_nocb_mask. This commit therefore avoids the cpumask_or() if NO_HZ_FULL_ALL=y and checks for !tick_nohz_full_running otherwise, this latter check catching cases when there was no nohz_full= kernel parameter specified. Signed-off-by: Paul E. McKenney --- Reading git-diff-tree failed