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    SubjectRe: [PATCH] move xchg/cmpxchg to atomic.h
       Date: Tue, 2 Jan 2001 11:22:42 +0000
    From: Matthew Wilcox <>

    We really can't. We _only_ have load-and-zero. And it has to be
    16-byte aligned. xchg() is just not something the CPU implements.

    Oh bugger... you do have real problems.

    David S. Miller
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