linux-kernel - Re: [PATCH 1/1] drivers/s390/cio/qdio_main.c: replace shift loop by ilog2

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Date:	Mon, 2 Jun 2014 16:41:48 +0200 (CEST)
From:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:	Fabian Frederick <fabf@...net.be>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/1] drivers/s390/cio/qdio_main.c: replace shift loop by
 ilog2

Hello Fabian,

On Tue, 20 May 2014, Fabian Frederick wrote:
> 
> This is untested.
> 
> Cc: Sebastian Ott <sebott@...ux.vnet.ibm.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  drivers/s390/cio/qdio_main.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
> index 77466c4..8bf9ec1 100644
> --- a/drivers/s390/cio/qdio_main.c
> +++ b/drivers/s390/cio/qdio_main.c
> @@ -411,15 +411,14 @@ static inline void qdio_stop_polling(struct qdio_q *q)
> 
>  static inline void account_sbals(struct qdio_q *q, int count)
>  {
> -	int pos = 0;
> +	int pos;
> 
>  	q->q_stats.nr_sbal_total += count;
>  	if (count == QDIO_MAX_BUFFERS_MASK) {
>  		q->q_stats.nr_sbals[7]++;
>  		return;
>  	}
> -	while (count >>= 1)
> -		pos++;
> +	pos = ilog2(count);
>  	q->q_stats.nr_sbals[pos]++;
>  }
> 
> -- 
> 1.8.4.5
> 
> 

Could you please resend the patch with a better description plus
the change Joe suggested.

Thanks,
Sebastian

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