linux-kernel - Re: [PATCH v3 4/4] input: serio: Replace timeval by timespec64

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Date:   Mon, 4 Dec 2017 14:44:40 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>
Subject: Re: [PATCH v3 4/4] input: serio: Replace timeval by timespec64

On Mon, Dec 4, 2017 at 1:55 AM, Deepa Dinamani <deepa.kernel@...il.com> wrote:
> struct timeval is not y2038 safe.
> All references to timeval will be deleted from the
> kernel to make it y2038 safe.
> Replace its uses by y2038 safe struct timespec64.
>
> The timestamps changed here only keep track of delta
> times. These timestamps are also internal to kernel.
> Hence, monotonic times are sufficient here.
> The unit of the delta times is also changed in certain
> cases to nanoseconds rather than microseconds. This is
> in line with timespec64 which keeps time in nanoseconds.
>
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>

Hi Deepa,

I forgot you also had these on your backlog. I submitted a different
set of patches
two weeks ago for the two HP drivers, originally by Pingbo Wen, based on a
different approach.

That version simplified the code in question a bit more by using jiffies,
while your version is a little safer since it changes less. Both versions
should be fine though, it's up to Dmitry which one he wants to pick up.

      Arnd