linux-kernel - Re: [PATCH 41/49] ext4: Add multi block allocator for ext4

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Date:	Thu, 24 Jan 2008 20:23:00 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Theodore Ts'o" <tytso@....EDU>, linux-kernel@...r.kernel.org,
	alex@...sterfs.com, adilger@...sterfs.com, sandeen@...hat.com,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 41/49] ext4: Add multi block allocator for ext4

On Thu, Jan 24, 2008 at 01:26:14PM +0530, Aneesh Kumar K.V wrote:
> 
> > 
> > > +/* find most significant bit */
> > > +static int fmsb(unsigned short word)
> > > +{
> > > +	int order;
> > > +
> > > +	if (word > 255) {
> > > +		order = 7;
> > > +		word >>= 8;
> > > +	} else {
> > > +		order = -1;
> > > +	}
> > > +
> > > +	do {
> > > +		order++;
> > > +		word >>= 1;
> > > +	} while (word != 0);
> > > +
> > > +	return order;
> > > +}
> > 
> > Did we just reinvent fls()?
> 
> replaced by fls.
> 
> > 

That should be fls() - 1;

The full patch is at

http://www.radian.org/~kvaneesh/ext4/jan-24-2008/mballoc-core.patch

The patch is too big to inline.

-aneesh
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