On Fri, 2013-08-16 at 18:39 +0100, Sudeep KarkadaNagesha wrote:

+#ifdef CONFIG_PPC
+               /* Check for historical "ibm,ppc-interrupt-server#s" property
+                * for thread ids on PowerPC. If it doesn't exist fallback to
+                * standard "reg" property.
+                */
+               if (__of_find_n_match_cpu_property(cpun,
+                               "ibm,ppc-interrupt-server#s", cpu, thread))
+                       return cpun;
+#endif

It's not "historical". It's still very much in use and well defined in PAPR :-)

Cheers,
Ben.