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

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Currently, rcu_do_batch() 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 per-callback invocation wastes CPU.  This commit therefore
created a const on-stack variable to allow this check to be done only
once per rcu_do_batch() invocation.

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

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Paul E. McKenney 2019-05-21 13:03:49 -07:00

parent 4f9c1bc727

commit ec5ef87bac

1 changed files with 5 additions and 5 deletions

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kernel/rcu/tree.c

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