PIO port width on various archs?

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I'm changing the kvm userspace interface to be more friendly to other archs. One issue is the PIO port size. x86 uses 16 bits to hold the port size (64K ports). Is that an issue for other archs?

I guess I could change it to __u32, but it's better to know what various architectures actually require.

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error compiling committee.c: too many arguments to function

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