[SPARC64]: Use machine description and OBP properly for cpu probing.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/asm-sparc64/hypervisor.h b/include/asm-sparc64/hypervisor.h
index 17b233b..0a241c8 100644
--- a/include/asm-sparc64/hypervisor.h
+++ b/include/asm-sparc64/hypervisor.h
@@ -120,6 +120,11 @@
  */
 #define HV_FAST_MACH_DESC		0x01
 
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_mach_desc(unsigned long buffer_pa, unsigned long buf_len,
+				     unsigned long *real_buf_len);
+#endif
+
 /* mach_exit()
  * TRAP:	HV_FAST_TRAP
  * FUNCTION:	HV_FAST_MACH_SIR