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    SubjectRe: cmpxchg in 2.5.38

    On Wed, Sep 25, 2002 at 01:00:44AM -0400, Pete Zaitcev wrote:
    > The cmpxchg() is used in kernel/pid.c:next_free_map():
    > It is implemented on alpha, i386, ia64, ppc64, ppc, sparc64,
    > x86_64, but not on mips, cris, arm, s390, s390x, sparc, sh, parisc.
    > Do all architectures have to have it?

    Ingo said that arches that cannot do cmpxchg in hardware should
    provide spinlock-based version.

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