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

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Date:   Tue, 12 Nov 2019 09:55:48 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     y2038@...ts.linaro.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        Sam Ravnborg <sam@...nborg.org>, Joe Perches <joe@...ches.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        "Kristian H. Kristensen" <hoegsberg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 14/16] drm/msm: avoid using 'timespec'

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@...eaurora.org>

> Signed-off-by: Arnd Bergmann <arnd@...db.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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