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

From: Christoph Hellwig <[email-masked]>
Date: Mon, 22 Aug 2022 04:30:05 -0700

On Mon, Aug 22, 2022 at 01:40:23PM +1000, Michael Ellerman wrote:
> Randy Dunlap <[email-masked]> writes:
> > 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?

I really do not think this has any business being exported at all.

kfd_queue_work is not something that should be done in a driver.
Something like this belongs into the workqueue core, not in an
underdocumented helper in a random driver.

Drm guys:  once again, please please work with the maintainers instead
of just making up random stuff in the drivers.