From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: [PATCH 12/12] sata_mv NCQ-EH for FIS-based switching
Date: Fri, 02 May 2008 08:44:14 -0400
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To: Jeff Garzik <jgarzik@pobox.com>, Tejun Heo <htejun@gmail.com>, IDE/ATA development list <linux-ide@vger.kernel.org>, Alan Cox <alan@redhat.com>

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.
But there must be several of them already out there (?)
Speed is unimportant here, so this version above
has been left simple -- no table lookups.