linux-kernel - Re: sh migor_defconfig build breakage

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Date:	Fri, 9 May 2008 09:50:06 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Mike Travis <travis@....com>
Cc:	Adrian Bunk <bunk@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: sh migor_defconfig build breakage

On Thu, May 08, 2008 at 03:12:46PM -0700, Mike Travis wrote:
> Mike Travis wrote:
> > Because some arch's have it defined as an inline function.  Perhaps the
> > easiest would be to add to include/asm-sh/topology.h a simple define of
> > cpu_to_node()?
> 
> Ahh, this is what caused the error.  In include/asm-generic/topology.h
> cpu_to_node is only defined now if NUMA is turned off.
> 
> #ifndef CONFIG_NUMA
> 
> /* Other architectures wishing to use this simple topology API should fill
>    in the below functions as appropriate in their own <asm/topology.h> file. */
> #ifndef cpu_to_node
> #define cpu_to_node(cpu)        ((void)(cpu),0)
> #endif
> ...
> 
> So before my change arch 'sh' used the default define whether NUMA was
> set or not.
> 
The dependency here is a bit vague in the first place. For UP NUMA the
asm-generic definitions are perfectly fine, it's only the CONFIG_NUMA &&
CONFIG_SMP cases where there is any point in doing anything more
fine-grained. So while it would be trivial to add a CONFIG_SMP test here
too, that's likely to break all of the other NUMA platforms.

So while sh can use the asm-generic definitions in the UP case, it
obviously can't on SMP. The easiest option for now is to just stub the
asm-generic bits in to asm-sh/topology.h under a CONFIG_NUMA ifdef and
then add more reasonable definitions for the SMP cases.
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