linux-kernel - Re: [PATCH 08/29] Staging: yaffs2: yaffs

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Message-ID: <AANLkTimHpKYMt=UD-rnPk+yZyYUUw2SHs5g1uNr7H-1d@mail.gmail.com>
Date:	Mon, 1 Nov 2010 21:04:21 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Tracey Dent <tdent48227@...il.com>
Cc:	greg@...ah.com, manningc2@...rix.gen.nz,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 08/29] Staging: yaffs2: yaffs_ecc: Add files

On Mon, Nov 1, 2010 at 8:40 PM, Tracey Dent <tdent48227@...il.com> wrote:
> Adding files to yaffs2 directory.
>
> Signed-off-by: Tracey Dent <tdent48227@...il.com>
> ---
>  drivers/staging/yaffs2/yaffs_ecc.c |  323 ++++++++++++++++++++++++++++++++++++
>  drivers/staging/yaffs2/yaffs_ecc.h |   44 +++++
>  2 files changed, 367 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/staging/yaffs2/yaffs_ecc.c
>  create mode 100644 drivers/staging/yaffs2/yaffs_ecc.h
>
> +
> +/* Count the bits in an unsigned char or a U32 */
> +
> +static int yaffs_count_bits(unsigned char x)
> +{
> +       int r = 0;
> +       while (x) {
> +               if (x & 1)
> +                       r++;
> +               x >>= 1;
> +       }
> +       return r;
> +}
> +
> +static int yaffs_count_bits32(unsigned x)
> +{
> +       int r = 0;
> +       while (x) {
> +               if (x & 1)
> +                       r++;
> +               x >>= 1;
> +       }
> +       return r;
> +}

Looks like bitmap_weight() to me.
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