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From: David Miller <davem@davemloft.net>
Subject: Re: Mostly portable strnlen_user()
Date: Fri, 25 May 2012 19:14:07 -0400 (EDT)
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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 25 May 2012 16:11:36 -0700

> Ugh. I'd rather then have a opaque typedef that may be a single word
> or a couple of words. Then it just declares that (without knowing what
> it is), and passes it around to the "find zeroes" and "get length from
> mask" functions.
> 
> For x86, it would be that single "mask" variable, for sparc it would
> be a struct of the "v" and "rhs" variables.
> 
> Hmm?

That might be better.

I suppose then I'd need to make BE's has_zero() a macro instead of a
function.  Either that or we pass a pointer to this opaque typedef
thing.