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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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