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Date: Tue, 13 Jan 2009 18:42:39 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: reif@earthlink.net, sparclinux-owner@vger.kernel.org, mingo@elte.hu,
       linux-kernel@vger.kernel.org
Subject: Re: sparc32 compile error: redefinition of =?UTF-8?Q?=E2=80=98smp?=
 =?UTF-8?Q?=5Fcall=5Ffunction=5Fsingle=E2=80=99?=
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On Tue, 13 Jan 2009 18:10:39 -0800 (PST) David Miller <davem@davemloft.net> wrote:

> From: Robert Reif <reif@earthlink.net>
> Date: Tue, 13 Jan 2009 20:40:04 -0500
> 
> > Todays git produces this compile error on sparc32:
> > 
> > kernel/up.c:10: error: redefinition of ___smp_call_function_single___
> > /usr/src/sparc32/linux-2.6/arch/sparc/include/asm/smp_32.h:78: error: previous definition of ___smp_call_function_single___ was here
> 
> Andrew, are you sure that Makefile condition for compiling
> up.o is correct?

you give me grounds for now being ;)

> ifeq ($(CONFIG_USE_GENERIC_SMP_HELPERS),y)
> obj-y += smp.o
> else
> obj-y += up.o
> endif
> 
> If an arch doesn't use generic SMP helpers, there is no way
> we should compile up.c into the tree when SMP.
> 

How's about this?

--- a/kernel/Makefile~a
+++ a/kernel/Makefile
@@ -43,7 +43,7 @@ obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
 ifeq ($(CONFIG_USE_GENERIC_SMP_HELPERS),y)
 obj-y += smp.o
 else
-obj-y += up.o
+obj-$(CONFIG_SMP) += up.o
 endif
 obj-$(CONFIG_SMP) += spinlock.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
_