linux-kernel - Re: [PATCH 1/3] m68knommu: fix undefined reference to `mach_get_rtc

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Date:   Tue, 24 May 2022 09:46:51 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Greg Ungerer <gerg@...ux-m68k.org>
Cc:     "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/3] m68knommu: fix undefined reference to `mach_get_rtc_pll'

Hi Greg,

On Wed, May 18, 2022 at 8:56 AM Greg Ungerer <gerg@...ux-m68k.org> wrote:
> Configuring for a nommu classic m68k target and enabling the generic rtc
> driver (CONFIG_RTC_DRV_GENERIC) will result in the following compile
> error:
>
>    m68k-linux-ld: arch/m68k/kernel/time.o: in function `rtc_ioctl':
>    time.c:(.text+0x82): undefined reference to `mach_get_rtc_pll'
>    m68k-linux-ld: time.c:(.text+0xbc): undefined reference to `mach_set_rtc_pll'
>    m68k-linux-ld: time.c:(.text+0xf4): undefined reference to `mach_set_rtc_pll'
>
> There is no definitions of "mach_set_rtc_pll" and "mach_get_rtc_pll" in the
> nommu code paths. Move these definitions and the associated "mach_hwclk",
> so that they are around their use case in time.c. This means they will
> always be defined on the builds that require them, and not on those that
> cannot use them - such as ColdFire (both with and without MMU enabled).
>
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Greg Ungerer <gerg@...ux-m68k.org>

> --- a/arch/m68k/kernel/time.c
> +++ b/arch/m68k/kernel/time.c
> @@ -82,6 +86,11 @@ void read_persistent_clock64(struct timespec64 *ts)
>  #endif
>
>  #if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
> +int (*mach_get_rtc_pll)(struct rtc_pll_info *);
> +int (*mach_set_rtc_pll)(struct rtc_pll_info *);
> +EXPORT_SYMBOL(mach_get_rtc_pll);
> +EXPORT_SYMBOL(mach_set_rtc_pll);

Oops, this causes build failures for Q40 with CONFIG_RTC_DRV_GENERIC=n,
as arch/m68k/q40/config.c uses mach_]gs]et_rtc_pll() unconditionally.

> +
>  static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
>  {
>         mach_hwclk(0, tm);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds