Heiko Carstens 491f6f8e5f lockref: use arch_mutex_cpu_relax() in CMPXCHG_LOOP() ...

Make use of arch_mutex_cpu_relax() so architectures can override the
default cpu_relax() semantics.
This is especially useful for s390, where cpu_relax() means that we
yield() the current (virtual) cpu and therefore is very expensive,
and would contradict the whole purpose of the lockless cmpxchg loop.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

2013-09-28 12:46:24 +02:00

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