[PATCH] ppc64 SMT bugfix

This patch is fairly straightforward.  maxcpus should be per SMT thread and
not per physical processor.  SUSE picked this up back in May (was discussed
on ppc64 mailing list) and has had no trouble with it.
Signed-off-by: Joel Schopp <jschopp@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/smp.c

@@ -426,7 +426,11 @@ static inline void look_for_more_cpus(void)
 	}
 
 	maxcpus = ireg[num_addr_cell + num_size_cell];
-	/* DRENG need to account for threads here too */
+
+	/* Double maxcpus for processors which have SMT capability */
+	if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
+		maxcpus *= 2;
+
 
 	if (maxcpus > NR_CPUS) {
 		printk(KERN_WARNING