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    SubjectRe: [patch] waitqueue optimization, 2.4.0-test7
       Date: Tue, 29 Aug 2000 04:26:18 +0200 (CEST)
    From: Andrea Arcangeli <>

    Alpha definitely needs mb(), ld_l/st_c doesn't imply any memory
    barrier (yes, alpha is very aggressive in SMP 8).

    I wonder if it then makes sense to just provide a set of bitops
    interfaces then which enforces the barrier. Or perhaps the other way
    around, make what we have now enforce the barriers and have
    __clear_bit et al. not do the memory barrier part.

    David S. Miller

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