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)").