linux-kernel - Re: [PATCH 3/4] input: Deprecate real timestamps beyond year 2106

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Message-ID: <2424772.suzB8dJZHE@wuerfel>
Date:   Tue, 13 Sep 2016 22:40:38 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, y2038@...ts.linaro.org
Subject: Re: [PATCH 3/4] input: Deprecate real timestamps beyond year 2106

On Tuesday, September 13, 2016 1:10:06 PM CEST Deepa Dinamani wrote:
> struct timeval is not y2038 safe.
> All usage of timeval in the kernel will be replaced by
> y2038 safe structures.
> 
> struct input_event maintains time for each input event.
> Real time timestamps are not ideal for input as this
> time can go backwards as noted in the patch a80b83b7b8
> by John Stultz. Hence, having the input_event.time fields
> only big enough for monotonic and boot times are
> sufficient.
> 
> Leave the original input_event as is. This is to maintain
> backward compatibility with existing userspace interfaces
> that use input_event.
> Introduce a new replacement struct raw_input_event.
> This replaces timeval with struct input_timeval. This structure
> maintains time in __kernel_ulong_t or compat_ulong_t to allow
> for architectures to override types as in the case of x32.
> 
> The change requires any userspace utilities reading or writing
> from event nodes to update their reading format to match
> raw_input_event.The changes to the popular libraries will be
> posted along with the kernel changes.
> The driver version is also updated to reflect the change in
> event format.
> 
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> 

Acked-by: Arnd Bergmann <arnd@...db.de>