rcu: Optimize RCU_FAST_NO_HZ for RCU_NOCB_CPU_ALL

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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>

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Paul E. McKenney 2013-11-17 21:08:07 -08:00

parent ffa83fb565

commit f1f399d128

1 changed files with 5 additions and 2 deletions

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7

kernel/rcu/tree_plugin.h

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