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    SubjectRe: [RFC PATCH 28/33] Add Xen grant table support
    > I object to these uses of (synch_)cmpxchg on a uint16_t in common  
    > code.
    > Many architectures, including PowerPC, do not support 2-byte atomic
    > operations, but this code is common to all Xen architectures.

    RMW operations you mean, I suppose. On PowerPC, all (naturally
    aligned) halfword operations are atomic; there do not exist any
    RMW operations; but word and doubleword atomic RMW operations
    can be emulated.

    Boils down to the same thing of course, but it isn't the same ;-)


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