linux-kernel - Re: [PATCH] rtc: sa1100: detect rcnr overflow with dates after 2038

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Message-ID: <20160119204653.GY3367@piout.net>
Date:	Tue, 19 Jan 2016 21:46:53 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Rob Herring <robh@...nel.org>, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: sa1100: detect rcnr overflow with dates after 2038

Hi,

On 19/01/2016 at 21:16:11 +0100, Robert Jarzmik wrote :
> Alexandre Belloni <alexandre.belloni@...e-electrons.com> writes:
> 
> > rcnr will overflow in 2038, detect that overflow when setting the time and
> > get rid of the deprecated rtc_tm_to_time()
> >
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> 
> That's very nice, but doesn't that limitation touch almost all drivers, and
> could benefit from a global solution in rtc_set_time() ?
> 
> What I'm thinking of is a field in rtc_device, a u64 which represents the
> maximal time that can be set (or 0 if no maximum). rtc_set_time() would check
> against that maximum and return -EINVAL.
> 
> For the rtc drivers, upon registration they can modify this value to set up this
> clamp. This will require to set only a value in each driver, which looks more
> robust to me.
> 

Actually, that is something I'm currently working on but it is not ready
yet.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com