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    SubjectRe: cmpxchg in 2.5.38
    On Wed, 25 Sep 2002, Ingo Molnar wrote:
    > On Wed, 25 Sep 2002, Oleg Drokin wrote:
    > > Ingo's argument was that since there is only one place in code that
    > > accesses that variable (map->page), it is safe to rely on such a
    > > crippled cmpxchg implementation.
    > yes. It's only this place in the code that ever modifies that word, and
    > that happens only once during the lifetime of this address, so i'll rather
    > add a spinlock to the generic PID allocator code, it's a very very rare
    > slowpath.

    Furthermore archs that have cmpxchg() define __HAVE_ARCH_CMPXCHG, while
    currently no code tests for it...



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