On Fri, May 2, 2008 at 5:44 AM, Mark Lord <liml@xxxxxx> wrote:
> By the way. If anyone can point out an existing EXPORTed
> "count number of one bits" in a word function, then I'll very happily
> submit a followup patch to remove this (below) and use that instead.
>
> ..
>
>
> > +static int mv_count_pmp_links(unsigned int pmp_map)
> > +{
> > + unsigned int link_count = 0;
> > +
> > + while (pmp_map) {
> > + link_count += (pmp_map & 1);
> > + pmp_map >>= 1;
> > + }
> > + return link_count;
> > +}
> >
> ..
>
> I grepped for one, but didn't find one.
include/asm-ia64/bitops.h:hweight64()
grundler <2186>fgrep hweight include/asm/*
include/asm/bitops_32.h:#include <asm-generic/bitops/hweight.h>
include/asm/bitops_64.h:#include <asm-generic/bitops/hweight.h>
> But there must be several of them already out there (?)
yup.
hth,
grant
> Speed is unimportant here, so this version above
> has been left simple -- no table lookups.
>
>
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