The static version of folio_has_cpupid() is defined in include/linux/mm.h if !CONFIG_NUMA_BALANCING but you define the function in memory-tiers.c unconditionally, a file that is compiled predicated on CONFIG_NUMA. So a config with !CONFIG_NUMA_BALANCING but CONFIG_NUMA set results in a compilation error (I just hit it this morning in mm-unstable). A minimal fix for this is to wrap the declaration in: #ifdef CONFIG_NUMA_BALANCING ... #endif I've tried this locally and it resolves the issue.
Agreed, with that Acked-by: David Hildenbrand <david@xxxxxxxxxx> -- Cheers, David / dhildenb
