From: Paul E. McKenney Date: Tue, 4 Nov 2014 02:20:20 +0000 (-0800) Subject: rcu: Don't initiate RCU priority boosting on root rcu_node X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~166^2^2^3~5 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1be0085b515e786e962b9f2d03616209eb6eb9a7;p=pandora-kernel.git rcu: Don't initiate RCU priority boosting on root rcu_node Because there is no longer any preempted tasks on the root rcu_node, and because there is no longer ever an rcub kthread for the root rcu_node, this commit drops the code in force_qs_rnp() that attempts to awaken the non-existent root rcub kthread. This is strictly a performance enhancement, removing a root rcu_node ->lock acquisition and release along with some tests in rcu_initiate_boost(), ending with the test that notes that there is no rcub kthread. Signed-off-by: Paul E. McKenney --- Reading git-diff-tree failed