linux-kernel - Re: sh migor_defconfig build breakage

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Date:	Thu, 08 May 2008 15:12:46 -0700
From:	Mike Travis <travis@....com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, lethal@...ux-sh.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: sh migor_defconfig build breakage

Mike Travis wrote:
> Mike Travis wrote:
>> Mike Travis wrote:
>>> Adrian Bunk wrote:
>>>> Commit aa6b54461cc5c0019b9d792adf3176b444c10763
>>>> (asm-generic: add node_to_cpumask_ptr macro)
>>>> causes the following build error with migor_defconfig:
>>>>
>>>> <--  snip  -->
>>>>
>>>> ...
>>>>   CC      arch/sh/kernel/asm-offsets.s
>>>> In file included from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/mm.h:8,
>>>>                  from /home/bunk/linux/kernel-2.6/git/linux-2.6/arch/sh/kernel/asm-offsets.c:13:
>>>> /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/gfp.h: In function 'alloc_pages_node':
>>>> /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/gfp.h:190: 
>>>> error: implicit declaration of function 'cpu_to_node'
>>>> make[2]: *** [arch/sh/kernel/asm-offsets.s] Error 1
>>>>
>>>> <--  snip  -->
>>>>
>>>> cu
>>>> Adrian
...
> 
> It looks like the migor_config has NUMA=y so is there not a cpu_to_node function?
> (looking with cscope didn't find it.)
> 
> I believe this may be the source of the error:
> 
> include/linux/gfp.h:
> 
> static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
>                                                 unsigned int order)
> {
> ...
>         /* Unknown node is current node */
>         if (nid < 0)
>                 nid = numa_node_id();
> 
> 
> include/linux/mmzone.h:
> 
> #include <linux/topology.h>
> /* Returns the number of the current Node. */
> #ifndef numa_node_id
> #define numa_node_id()          (cpu_to_node(raw_smp_processor_id()))
> #endif
> 
> 
> I can't put into include/linux/topology.h the catchall default:
> 
> #ifndef cpu_to_node
> #define cpu_to_node(cpu)	(0)
> #endif
> 
> 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()?
> 
> Thanks,
> Mike


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.

An alternative would be to change all the arch's that define cpu_to_node
as an inline to:

#define cpu_to_node(cpu)	_cpu_to_node(cpu)
static inline int _cpu_to_node(int cpu)
{
	...
}

Then include/linux/topology could define cpu_to_node if it's not already
defined.

Andrew or Ingo - do you have any preferences?

Thanks,
Mike

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