linux-kernel - Re: [PATCH] powerpc: export cpu_smallcore

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Date:   Mon, 22 Aug 2022 04:30:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        "Gautham R . Shenoy" <ego@...ux.vnet.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org, amd-gfx@...ts.freedesktop.org,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH] powerpc: export cpu_smallcore_map for modules

On Mon, Aug 22, 2022 at 01:40:23PM +1000, Michael Ellerman wrote:
> Randy Dunlap <rdunlap@...radead.org> 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.