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 09:46:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <ak@...e.de>
Cc:	"Miles Lane" <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"shannon.nelson@...el.com" <shannon.nelson@...el.com>,
	"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 Fri, 10 Aug 2007 15:27:42 +0200 Andi Kleen <ak@...e.de> wrote:

> On Thursday 09 August 2007 20:52:58 Andrew Morton 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.
> 
> 
> It doesn't make much sense in smp.h because there is not really
> a concept of physical id on most architectures i expect. Better 
> to put it into the individual asm files.
> 

I gave up and did this:

From: Andrew Morton <akpm@...ux-foundation.org>

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'

This is soooo screwed up.  Root cause: linux/smp.h only includes asm/smp.h if
CONFIG_SMP=y.

To get at cpu_physical_id() on UP, the user must include asm/smp.h, not
linux/smp.h.

Cc: "Luck, Tony" <tony.luck@...el.com>
Cc: Andi Kleen <ak@...e.de>
Cc: Shannon Nelson <shannon.nelson@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/dma/ioat_dca.c |    3 +++
 1 file changed, 3 insertions(+)

diff -puN drivers/dma/ioat_dca.c~git-dma-up-fix drivers/dma/ioat_dca.c
--- a/drivers/dma/ioat_dca.c~git-dma-up-fix
+++ a/drivers/dma/ioat_dca.c
@@ -25,6 +25,9 @@
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/dca.h>
+
+#include <asm/smp.h>
+
 #include "ioatdma.h"
 #include "ioatdma_registers.h"
 
_

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