Re: [PATCH] m68knommu: fix undefined reference to `mach_get_rtc_pll'

[Greg Ungerer <gerg@linux-m68k.org>]

Hi Arnd,

On 13/5/22 22:59, Arnd Bergmann wrote:
> On Fri, May 13, 2022 at 2:25 PM Greg Ungerer <gerg@linux-m68k.org> wrote:
>> On 13/5/22 17:12, Geert Uytterhoeven wrote:
>>> read_persistent_clock64() uses mach_hwclk(), which is provided by
>>> both setup_mm.c and setup_no.c, so it's always available?> Albeit not populated by coldfire or nommu platform code, so I see
>>> the point in depending on MMU (no nommu Amiga support yet ;-).
>>
>> Yes, exactly. And even worse is that on ColdFire platforms it
>> is never set, so will be the startup value of NULL. It is called
>> without checking for NULL in both of rtc_generic_get_time() and
>> rtc_generic_set_time().
> 
> I think that's ok because rtc_generic_{get,set}_time is only called
> from the rtc_generic driver, but that is not registered when mach_hwclk()
> is NULL.
> 
> With your patch to add the CONFIG_MMU check, you can actually
> remove the mach_hwclk() symbol from setup_no.c, and move the
> remaining RTC related symbols from setup_mm.c into the #ifdef.

Yes, I think that would be a good idea.
Tidies thins up a little.

Regards
Greg