Subject: Re: [PATCH] powerpc: export cpu_smallcore_map for modules

From: Michael Ellerman <[email-masked]>
Date: Mon, 22 Aug 2022 13:40:23 +1000

Randy Dunlap <[email-masked]> writes:
> Fix build error when CONFIG_DRM_AMDGPU=m:
>
> ERROR: modpost: "cpu_smallcore_map" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
>
> by exporting 'cpu_smallcore_map' just as other per_cpu
> symbols are exported.
>
> drivers/gpu/drm/amd/amdkfd/kfd_device.c calls cpu_smt_mask().
> This is an inline function on powerpc which references
> cpu_smallcore_map.
>
> Fixes: 425752c63b6f ("powerpc: Detect the presence of big-cores via "ibm, thread-groups"")
> Fixes: 7bc913085765 ("drm/amdkfd: Try to schedule bottom half on same core")

That 2nd commit is not in mainline, only linux-next.

I don't mind merging this fix preemptively, but is that SHA stable?

cheers