rcu: Optimize and protect atomic_cmpxchg() loop

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This commit reworks the atomic_cmpxchg() loop in rcu_eqs_special_set()
to do only the initial read from the current CPU's rcu_data structure's
->dynticks field explicitly.  On subsequent passes, this value is instead
retained from the failing atomic_cmpxchg() operation.

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

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This commit is contained in:

Paul E. McKenney 2020-02-03 14:20:00 -08:00

parent 92c0b889f2

commit faa059c397

1 changed files with 5 additions and 2 deletions

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kernel/rcu/tree.c

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