linux-kernel - Re: Build failure in -next due to 'rtc: cmos: move mc146818rtc code out of asm-generic/rtc.h'

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Date:	Sat, 4 Jun 2016 00:16:57 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Jiri Kosina <jikos@...nel.org>
Subject: Re: Build failure in -next due to 'rtc: cmos: move mc146818rtc code
 out of asm-generic/rtc.h'

Hi,

On 03/06/2016 at 07:44:55 -0700, Guenter Roeck wrote :
> On 06/03/2016 05:11 AM, Arnd Bergmann wrote:
> > I have trouble reproducing this, but I think the problem here is that there
> > are two definitions of CMOS_READ() in sparc, and we pick up the wrong one
> > here: there is no 'rtc_port' variable outside of drivers/char/rtc.c, and we
> > don't build that file any more on sparc32, so we probably want this patch:
> > 
> > diff --git a/arch/sparc/include/asm/io_32.h b/arch/sparc/include/asm/io_32.h
> > index 57f26c398dc9..4dd268a3a8b0 100644
> > --- a/arch/sparc/include/asm/io_32.h
> > +++ b/arch/sparc/include/asm/io_32.h
> > @@ -140,16 +140,6 @@ void ioport_unmap(void __iomem *);
> >   struct pci_dev;
> >   void pci_iounmap(struct pci_dev *dev, void __iomem *);
> > 
> > -
> > -
> > -/*
> > - * At the moment, we do not use CMOS_READ anywhere outside of rtc.c,
> > - * so rtc_port is static in it. This should not change unless a new
> > - * hardware pops up.
> > - */
> > -#define RTC_PORT(x)   (rtc_port + (x))
> > -#define RTC_ALWAYS_BCD  0
> > -
> >   static inline int sbus_can_dma_64bit(void)
> >   {
> >   	return 0; /* actually, sparc_cpu_model==sun4d */
> > 
> > 
> > 
> > Can you check if this fixes the problem?
> > 
> 
> Yes, it does. I did test builds with both sparc:allmodconfig and sparc64:allmodconfig
> after applying above diff; both passed.
> 

Arnd, do you mind sending a proper patch that I'll apply before 'rtc:
cmos: move mc146818rtc code out of asm-generic/rtc.h'? Else, I could
squash it in but I think the former is cleaner.

Thanks!

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