linux-kernel - Re: [PATCH RESEND] sgi-gru: use time

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Message-ID: <20140530171507.GA85969@sgi.com>
Date:	Fri, 30 May 2014 12:15:07 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Manuel Schölling <manuel.schoelling@....de>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH RESEND] sgi-gru: use time_before()

Acked-by: Dimitri Sivanich <sivanich@....com>

On Fri, May 30, 2014 at 03:40:59PM +0200, Manuel Schölling wrote:
> To be future-proof and for better readability the time comparisons are
> modified to use time_before() instead of plain, error-prone math.
> 
> Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
> ---
>  drivers/misc/sgi-gru/grumain.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
> index ae16c8c..1525870 100644
> --- a/drivers/misc/sgi-gru/grumain.c
> +++ b/drivers/misc/sgi-gru/grumain.c
> @@ -930,6 +930,7 @@ int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
>  {
>  	struct gru_thread_state *gts;
>  	unsigned long paddr, vaddr;
> +	unsigned long expires;
>  
>  	vaddr = (unsigned long)vmf->virtual_address;
>  	gru_dbg(grudev, "vma %p, vaddr 0x%lx (0x%lx)\n",
> @@ -954,7 +955,8 @@ again:
>  			mutex_unlock(&gts->ts_ctxlock);
>  			set_current_state(TASK_INTERRUPTIBLE);
>  			schedule_timeout(GRU_ASSIGN_DELAY);  /* true hack ZZZ */
> -			if (gts->ts_steal_jiffies + GRU_STEAL_DELAY < jiffies)
> +			expires = gts->ts_steal_jiffies + GRU_STEAL_DELAY;
> +			if (time_before(expires, jiffies))
>  				gru_steal_context(gts);
>  			goto again;
>  		}
> -- 
> 1.7.10.4
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