Excerpts from Stephen Frost's message of mar may 24 22:56:21 -0400 2011:
> A couple of notes regarding the patch:
>
> First, it uses ffs(), which might not be fully portable.. We could
> certainly implement the same thing in userspace and use ffs() when
> it's available.
Err, see RIGHTMOST_ONE in bitmapset.c.
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