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    SubjectRe: cmpxchg in 2.5.38
       From: Ingo Molnar <>
    Date: Wed, 25 Sep 2002 10:26:34 +0200 (CEST)

    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

    You can't define a crippled primitive like this Ingo.

    What if someone else starts to use it?

    And more importantly, if you can't use it on a datum shared between
    userspace and the kernel, you have to name it something other than
    cmpxchg or make the DRM use something else.
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