rcu: Optimize rcu_needs_cpu() for RCU_NOCB_CPU_ALL

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If CONFIG_RCU_NOCB_CPU_ALL=y, then rcu_needs_cpu() will always
return false, however, the current version nevertheless checks
for RCU callbacks.  This commit therefore creates a static inline
implementation of rcu_needs_cpu() that unconditionally returns false
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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This commit is contained in:

Paul E. McKenney 2013-11-17 19:27:16 -08:00

parent 2f33b512a5

commit ffa83fb565

5 changed files with 15 additions and 7 deletions

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8

include/linux/rcupdate.h

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6

include/linux/rcutiny.h

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2

include/linux/rcutree.h

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2

kernel/rcu/tree.c

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4

kernel/rcu/tree_plugin.h

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