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

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Message-ID: <87o7wdkkt4.fsf@mpe.ellerman.id.au>
Date:   Mon, 22 Aug 2022 13:40:23 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.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>
Subject: Re: [PATCH] powerpc: export cpu_smallcore_map for modules

Randy Dunlap <rdunlap@...radead.org> 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