linux-kernel - Re: [PATCH] scsi-ioctl: use clock

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Date:	Mon, 17 Nov 2008 13:08:48 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Milton Miller <miltonm@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi-ioctl: use clock_t <> jiffies

On Sat, Nov 15 2008, Milton Miller wrote:
> Convert the timeout ioctl scalling to use the clock_t functions
> which are much more accurate with some USER_HZ vs HZ combinations.
> 
> Signed-off-by: Milton Miller <miltonm@....com>
> ---
> While doing some work with low HZ rates for a simulator, 
> I saw a divide-by-zero warning that pointed out these 
> hz scales.
> 
> 
> Index: sim/block/scsi_ioctl.c
> ===================================================================
> --- sim.orig/block/scsi_ioctl.c	2008-11-11 01:19:29.000000000 -0600
> +++ sim/block/scsi_ioctl.c	2008-11-11 01:22:11.000000000 -0600
> @@ -60,7 +60,7 @@ static int scsi_get_bus(struct request_q
>  
>  static int sg_get_timeout(struct request_queue *q)
>  {
> -	return q->sg_timeout / (HZ / USER_HZ);
> +	return jiffies_to_clock_t(q->sg_timeout);
>  }
>  
>  static int sg_set_timeout(struct request_queue *q, int __user *p)
> @@ -68,7 +68,7 @@ static int sg_set_timeout(struct request
>  	int timeout, err = get_user(timeout, p);
>  
>  	if (!err)
> -		q->sg_timeout = timeout * (HZ / USER_HZ);
> +		q->sg_timeout = clock_t_to_jiffies(timeout);
>  
>  	return err;
>  }

Thanks, applied to for-2.6.29

-- 
Jens Axboe

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