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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Message-Id: <20070809115258.5372f76e.akpm@linux-foundation.org>
Date:	Thu, 9 Aug 2007 11:52:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Miles Lane" <miles.lane@...il.com>
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 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 */
 
 /*
_

-
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