tree d51c511d6d0afc746ff1e92649f6312dc8288110
parent 6cf539a87a61a4fbc43f625267dbcbcf283872ed
author Paul E. McKenney <paulmck@kernel.org> 1572443517 -0700
committer Paul E. McKenney <paulmck@kernel.org> 1575923097 -0800

rcu: Substitute lookup for bit-twiddling in sync_rcu_exp_select_node_cpus()

The code in sync_rcu_exp_select_node_cpus() calculates the current
CPU's mask within its rcu_node structure's bitmasks, but this has
already been computed in the ->grpmask field of that CPU's rcu_data
structure.  This commit therefore just uses this ->grpmask field.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>