[POWERPC] Add the thread_siblings files to sysfs

This adds the /sys/devices/system/cpu/*/topology/thread_siblings
files on powerpc.  These files are already available on other
architectures.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

include/asm-powerpc/topology.h

@@ -97,6 +97,12 @@ static inline void sysfs_remove_device_from_node(struct sys_device *dev,
 #ifdef CONFIG_SMP
 #include <asm/cputable.h>
 #define smt_capable()		(cpu_has_feature(CPU_FTR_SMT))
+
+#ifdef CONFIG_PPC64
+#include <asm/smp.h>
+
+#define topology_thread_siblings(cpu)	(cpu_sibling_map[cpu])
+#endif
 #endif
 
 #endif /* __KERNEL__ */