Re: [PATCH 14/16] drm/msm: avoid using 'timespec'

[Jordan Crouse <jcrouse@codeaurora.org>]

On Fri, Nov 08, 2019 at 10:32:52PM +0100, Arnd Bergmann wrote:
> The timespec structure and associated interfaces are deprecated and will
> be removed in the future because of the y2038 overflow.
> 
> The use of ktime_to_timespec() in timeout_to_jiffies() does not
> suffer from that overflow, but is easy to avoid by just converting
> the ktime_t into jiffies directly.

This seems good to me. y2038 changes are the best changes.

Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/drm/msm/msm_drv.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 71547e756e29..740bf7c70d8f 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -454,8 +454,7 @@ static inline unsigned long timeout_to_jiffies(const ktime_t *timeout)
>  		remaining_jiffies = 0;
>  	} else {
>  		ktime_t rem = ktime_sub(*timeout, now);
> -		struct timespec ts = ktime_to_timespec(rem);
> -		remaining_jiffies = timespec_to_jiffies(&ts);
> +		remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ);
>  	}
>  
>  	return remaining_jiffies;
> -- 
> 2.20.0
> 

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