Re: sh migor_defconfig build breakage

From: Mike Travis
Date: Thu May 08 2008 - 18:13:38 EST


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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