linux-kernel - [PATCH] powerpc: export cpu_smallcore

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Date:   Fri, 19 Aug 2022 14:01:12 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        "Gautham R . Shenoy" <ego@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        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: [PATCH] powerpc: export cpu_smallcore_map for modules

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")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: amd-gfx@...ts.freedesktop.org
Cc: Felix Kuehling <Felix.Kuehling@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Christian König <christian.koenig@....com>
Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
---
 arch/powerpc/kernel/smp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -86,6 +86,7 @@ DEFINE_PER_CPU(cpumask_var_t, cpu_core_m
 static DEFINE_PER_CPU(cpumask_var_t, cpu_coregroup_map);
 
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
+EXPORT_PER_CPU_SYMBOL(cpu_smallcore_map);
 EXPORT_PER_CPU_SYMBOL(cpu_l2_cache_map);
 EXPORT_PER_CPU_SYMBOL(cpu_core_map);
 EXPORT_SYMBOL_GPL(has_big_cores);