On Tue, 2022-11-22 at 08:55 -0500, Alex Deucher wrote: > > > > + /kisskb/src/arch/um/include/asm/processor-generic.h: error: called object is not a function or function pointer: => 94:18 > > + /kisskb/src/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c: error: control reaches end of non-void function [-Werror=return-type]: => 1934:1 > > > > um-x86_64/um-all{mod,yes}config (in kfd_cpumask_to_apic_id()) > > Presumably cpu_data is not defined on um-x86_64? Does it even make > sense to build drivers on um-x86_64? Drivers in general yes ;-) This driver, probably not. But the issue is that a lot of drivers "depends on X86_64" or such, where only "X86" is the arch symbol. You could add "X86 && X86_64" to really build on x86 64-bit only. I didn't check this driver, but this has mostly popped up since UM got PCI support some time ago (which I added.) johannes