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David Howells wrote: > Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > >>We have atomic_cmpxchg. Can you use that for a sufficient generic >>implementation? > > > No. CMPXCHG/CAS is not as available as XCHG, and it's also unnecessary. > atomic_cmpxchg should be available on all platforms. While it may be strictly unnecessary, if it can be used to avoid having a crappy default implementation that requires it to be reimplemented in all architectures then that would be a good thing. Any arguments about bad scalability or RT behaviour of the hashed spinlock emulation atomic_t implementations are silly because they are used by all atomic_ operations. It is an arch implementation detail that generic code should not have to worry about. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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