Re: [PATCH RESEND] sgi-gru: use time_before()

[Dimitri Sivanich]

Acked-by: Dimitri Sivanich <sivan...@sgi.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.schoell...@gmx.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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