From: Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Jordan Crouse <jcrouse-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
y2038-cunTk1MwBs8s++Sfvej+rw@public.gmane.org,
Rob Clark <robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: [PATCH] drm/msm: avoid using 'timespec'
Date: Tue, 10 Jul 2018 16:47:36 -0400 [thread overview]
Message-ID: <20180710204736.GU20303@art_vandelay> (raw)
In-Reply-To: <20180618153959.2169325-1-arnd-r2nGTMty4D4@public.gmane.org>
On Mon, Jun 18, 2018 at 05:39:42PM +0200, 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.
>
> 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 b2da1fbf81e0..cc8977476a41 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -353,8 +353,7 @@ 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);
Do you need to wrap rem in ktime_to_ns() just to be safe?
Sean
> }
>
> return remaining_jiffies;
> --
> 2.9.0
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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next prev parent reply other threads:[~2018-07-10 20:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-18 15:39 [PATCH] drm/msm: avoid using 'timespec' Arnd Bergmann
[not found] ` <20180618153959.2169325-1-arnd-r2nGTMty4D4@public.gmane.org>
2018-07-10 20:47 ` Sean Paul [this message]
2018-07-10 21:27 ` Arnd Bergmann
2018-07-11 14:00 ` Sean Paul
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