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    SubjectRe: Reduce struct page by 8 bytes on 64bit
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       From: Andi Kleen <ak@muc.de>
    Date: Tue, 15 Apr 2003 13:24:30 +0200

    I worked around this by declaring a new data type atomic_bitmask32
    with matching set_bit32/clear_bit32 etc. interfaces. Currently only
    on x86-64 aomitc_bitmask32 is defined to unsigned, everybody else
    still uses unsigned long. The other 64bit architectures can define it to
    unsigned too if they can confirm that it's ok to do.

    I have no problem with this.

    If you are clever, you can define a generic version even for the
    "unsigned long" 64-bit platforms. It's left as an exercise to
    the reader :-)
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