linux-kernel - Re: sparc32 compile error: redefinition of ‘smp_call_function

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Message-Id: <20090113184239.e6b6e68e.akpm@linux-foundation.org>
Date:	Tue, 13 Jan 2009 18:42:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	reif@...thlink.net, sparclinux-owner@...r.kernel.org,
	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: sparc32 compile error: redefinition of ‘smp_call_function_single’

On Tue, 13 Jan 2009 18:10:39 -0800 (PST) David Miller <davem@...emloft.net> wrote:

> From: Robert Reif <reif@...thlink.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
_

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