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SubjectRe: linux-next: build failure after merge of the final tree (akpm tree related)
Stephen Rothwell wrote:
> Hi Andrew,
>
> Today's linux-next fails to build (s390 allnoconfig) like this:
>
> In file included from arch/s390/mm/maccess.c:15:
> include/linux/gfp.h: In function 'gfp_zonelist':
> include/linux/gfp.h:267: error: '__enabled_CONFIG_NUMA' undeclared (first use in this function)
> include/linux/gfp.h:267: error: (Each undeclared identifier is reported only once
> include/linux/gfp.h:267: error: for each function it appears in.)
> include/linux/gfp.h:267: error: '__enabled_CONFIG_NUMA_MODULE' undeclared (first use in this function)
>
> and many more. This also happens in other architectures and configs but
> (obviously) not all builds.
>
> Presumably caused by commit 053361e1a072 ("mm: replace NUMA_BUILD with
> IS_ENABLED(CONFIG_NUMA)").
>

Oops, yes, my fault.

'config NUMA' defined in arch-specific Kconfig, some of them does not have it.
Thus Kconfig generates these constants not for all architectures.

config MIGRATION and config COMPACTION already in generic mm/Kconfig


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