commit f1f399d1281ea339a08469f7e58193624992f620
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> Sun Nov 17 21:08:07 2013 -0800
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> Mon Feb 17 16:03:33 2014 -0800
tree 915284120382e3180c3e58ba157cf045998549d0
parent ffa83fb565fbc397cbafb4b71fd1cce276d4c3b6

rcu: Optimize RCU_FAST_NO_HZ for RCU_NOCB_CPU_ALL

If CONFIG_RCU_NOCB_CPU_ALL=y, then no CPU will ever have RCU callbacks
because these callbacks will instead be handled by the rcuo kthreads.
However, the current version of RCU_FAST_NO_HZ nevertheless checks for RCU
callbacks.  This commit therefore creates static inline implementations
of rcu_prepare_for_idle() and rcu_cleanup_after_idle() that are no-ops
when CONFIG_RCU_NOCB_CPU_ALL=y.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>