rcu/nocb: Use build-time no-CBs check in rcu_core()

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Currently, rcu_core() invokes rcu_segcblist_is_offloaded() each time it
needs to know whether the current CPU is a no-CBs CPU.  Given that it is
not possible to change the no-CBs status of a CPU after boot, and given
that it is not possible to even have no-CBs CPUs in CONFIG_RCU_NOCB_CPU=n
kernels, this repeated runtime invocation wastes CPU.  This commit
therefore created a const on-stack variable to allow this check to be
done only once per rcu_core() invocation.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

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Paul E. McKenney 2019-05-21 13:39:15 -07:00

parent ec5ef87bac

commit c1ab99d66e

1 changed files with 4 additions and 4 deletions

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kernel/rcu/tree.c

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