[PATCH v2] powerpc: export cpu_to_core_id()

[Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>]

Export cpu_to_core_id().  This will be used by the lpfc driver.

This enables topology_core_id() from  <linux/topology.h> (defined
to cpu_to_core_id() in arch/powerpc/include/asm/topology.h) to be
used by (non-builtin) modules.

That is arch-neutral, already used by eg, drivers/base/topology.c,
but it is builtin (obj-y in Makefile) thus didn't need the export.

Since the module uses topology_core_id() and this is defined to
cpu_to_core_id(), it needs the export, otherwise:

    ERROR: "cpu_to_core_id" [drivers/scsi/lpfc/lpfc.ko] undefined!
    make[1]: *** [__modpost] Error 1
    make: *** [modules] Error 2

Tested on next-20160601.

Changelog:
 - v2: include details about the need for this patch with regards 
       to the architecture-neutral topology API.

Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/smp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 55c924b..67136e7 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -593,6 +593,7 @@ out:
 	of_node_put(np);
 	return id;
 }
+EXPORT_SYMBOL_GPL(cpu_to_core_id);
 
 /* Helper routines for cpu to core mapping */
 int cpu_core_index_of_thread(int cpu)
-- 
1.8.3.1