linux-kernel - Re: 2.6.23-rc2-mm1 -- drivers/dma/ioat_dca.c:177: error: implicit declaration of function ___cpu_physical_id__

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Date:	Fri, 10 Aug 2007 09:13:05 -0400
From:	"Miles Lane" <miles.lane@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"shannon.nelson@...el.com" <shannon.nelson@...el.com>,
	"Andi Kleen" <ak@...e.de>, "Luck, Tony" <tony.luck@...el.com>
Subject: Re: 2.6.23-rc2-mm1 -- drivers/dma/ioat_dca.c:177: error: implicit declaration of function ___cpu_physical_id___

On 8/9/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Thu, 9 Aug 2007 10:18:15 -0400
> "Miles Lane" <miles.lane@...il.com> wrote:
>
> >   CC      drivers/dma/ioat_dca.o
> > drivers/dma/ioat_dca.c: In function 'ioat_dca_get_tag':
> > drivers/dma/ioat_dca.c:177: error: implicit declaration of function
> > 'cpu_physical_id'
>
> Looks like cpu_physical_id() doesn't get implemented if CONFIG_SMP=n.
>
> Either ioat needs to stop using cpu_physical_id() if SMP=n, or the
> supported architectures (i386, x86_64, ia64) should provide a non-SMP
> version of cpu_physical_id().  Preferably the latter, I'd say.
>
> Something like this, I suppose...
>
>
> From: Andrew Morton <akpm@...ux-foundation.org>
>
> i386, x86_64 and ia64 implement cpu_physical_id() if CONFIG_SMP=y.
>
> Provide a uniprocessor stub so that callers will dtrt.
>
> Cc: Andi Kleen <ak@...e.de>
> Cc: "Luck, Tony" <tony.luck@...el.com>
> Cc: Shannon Nelson <shannon.nelson@...el.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
>  include/linux/smp.h |    5 +++++
>  1 files changed, 5 insertions(+)
>
> diff -puN include/linux/smp.h~implement-cpu_physical_id-on-smp=n include/linux/smp.h
> --- a/include/linux/smp.h~implement-cpu_physical_id-on-smp=n
> +++ a/include/linux/smp.h
> @@ -108,6 +108,11 @@ static inline void smp_send_reschedule(i
>         0;                      \
>  })
>
> +static inline unsigned cpu_physical_id(unsigned cpu)
> +{
> +       return 0;
> +}
> +
>  #endif /* !SMP */
>
>  /*
> _

Worked for me.
Thanks,
      Miles
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