linux-kernel - Re: [RFC PATCH 2/4] rtc: Convert rtc_class_ops.set_mmss() to use time64

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Date:	Fri, 28 Nov 2014 00:05:34 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Xunlei Pang <pang.xunlei@...aro.org>
cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Sven Schnelle <svens@...ckframe.org>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [RFC PATCH 2/4] rtc: Convert rtc_class_ops.set_mmss() to use
 time64_t

On Thu, 27 Nov 2014, Xunlei Pang wrote:
> -static int coh901331_set_mmss(struct device *dev, unsigned long secs)
> +static int coh901331_set_mmss(struct device *dev, time64_t secs)
>  {
>  	struct coh901331_port *rtap = dev_get_drvdata(dev);
>  
>  	clk_enable(rtap->clk);
> +	/*
> +	 * y2106 issue:
> +	 *   On 32bit systems the time64_t secs value gets cast to
> +	 *   a 32bit long, and thus we can only write a maximum value
> +	 *   of y2016

That really makes a lot of sense. Before that patch the driver was
safe up to 2038. Now it is facing the y2016 problem.

> +	/*
> +	 * y2106 issue:
> +	 *   On 32bit systems the time64_t secs value gets cast to
> +	 *   a 32bit long, and thus we can only write a maximum value
> +	 *   of y2016

Copy and paste is wonderful, right?

Sigh,

	tglx
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