linux-kernel - Re: [PATCH 1/4] rtc-lib: Add rtc_show_time(const char *prefix

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Date:   Tue, 18 Jul 2017 10:41:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Mark Salyzyn <salyzyn@...roid.com>, linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, len.brown@...el.com, pavel@....cz,
        linux-pm@...r.kernel.org, a.zummo@...ertech.it,
        alexandre.belloni@...e-electrons.com, linux-rtc@...r.kernel.org
Subject: Re: [PATCH 1/4] rtc-lib: Add rtc_show_time(const char *prefix_msg)

On Tue, 2017-07-18 at 10:25 -0700, Mark Salyzyn wrote:
> Go directly to the rtc for persistent wall clock time and print.
> Useful if REALTIME is required to be logged in a low level power
> management function or when clock activities are suspended.  An
> aid to permit user space alignment of kernel activities.
[]
> diff --git a/include/linux/rtc.h b/include/linux/rtc.h
[]
> @@ -22,6 +22,11 @@ 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);
> +#ifdef CONFIG_RTC_SHOW_TIME
> +extern void rtc_show_time(const char *prefix_msg);
> +#else
> +#define rtc_show_time(prefix_msg)

It's generally better to use a static inline to avoid
misuses in newly added code in the !CONFIG_RTC_SHOW_TIME
compile path when CONFIG_RTC_SHOW_TIME may not be compiled.

static inline void rtc_show_time(const char *prefix_msg)
{
}