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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-09-23 14:59:56 +0400
committerHeiko Carstens <heiko.carstens@de.ibm.com>2013-09-28 14:46:24 +0400
commit491f6f8e5fd9a57aaf03b6d6e3e153f1c27d8a46 (patch)
tree81cb77f31a841e87cecb9329f26e6524cc44f3a2 /lib/reciprocal_div.c
parent083986e8248d978b6c961d3da6beb0c921c68220 (diff)
downloadlinux-491f6f8e5fd9a57aaf03b6d6e3e153f1c27d8a46.tar.xz
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>
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