linux-kernel - Re: [PATCH v2 2/4] rtc/lib: Introduce rtc_tm

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Message-ID: <20150611170619.GM5222@piout.net>
Date:	Thu, 11 Jun 2015 19:06:19 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Xunlei Pang <xlpang@....com>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Xunlei Pang <pang.xunlei@...aro.org>
Subject: Re: [PATCH v2 2/4] rtc/lib: Introduce rtc_tm_subtract() helper
 function

Hi,

I'm fine with the whole series, I would just rename things a bit:

On 02/06/2015 at 17:04:20 +0800, Xunlei Pang wrote :
>  /*
> + * rtc_tm_subtract - Return the difference in seconds.
> + */
> +time64_t rtc_tm_subtract(struct rtc_time *minuend, struct rtc_time *subtrahend)
> +{
> +	return rtc_tm_to_time64(minuend) - rtc_tm_to_time64(subtrahend);
> +}
> +EXPORT_SYMBOL_GPL(rtc_tm_subtract);
> +
> +/*
>   * Convert rtc_time to ktime
>   */
>  ktime_t rtc_tm_to_ktime(struct rtc_time tm)
> diff --git a/include/linux/rtc.h b/include/linux/rtc.h
> index 8dcf682..13e4138 100644
> --- a/include/linux/rtc.h
> +++ b/include/linux/rtc.h
> @@ -21,6 +21,8 @@ extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year
>  extern int rtc_valid_tm(struct rtc_time *tm);
>  extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
>  extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
> +extern time64_t rtc_tm_subtract(struct rtc_time *minuend,
> +		struct rtc_time *subtrahend);

I would use something closer to what is done for timespecs in time.h,
like:

static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
{
	return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
}

and not modify rtc-lib.c

Can you make that modification ?

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