Messages in this thread |  | | | Date | Thu, 22 Dec 2005 19:03:32 +1100 | | From | Nick Piggin <> | | Subject | Re: [patch 2/5] mutex subsystem: add architecture specific mutex primitives |
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Nick Piggin wrote:
> I think ARMv6 has a decent atomic_cmpxchg implementation but does > not define __HAVE_ARCH_CMPXCHG. It might be useful to try to use this > for ARMv6 SMP for a slightly better trylock. >
And on UP builds, it may simply be best to open code an interrupt unsafe cmpxchg and use atomic_cmpxchg unconditionally on SMP builds (which I think generates half decent code on all SMP architectures).
Just something to think about. Of course this will require the dreaded preempt_disable() which might make it a showstopper.
-- SUSE Labs, Novell Inc.
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