powerpc/prom: early_init_dt_scan_cpus() updates cpu features only once

All our cpu feature updates were done for every CPU in the device-tree,
thus overwriting the cputable bits over and over again. Instead do them
only for the boot CPU.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/prom.c

@@ -347,12 +347,14 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 #endif
 	}
 
-	if (found >= 0) {
+	/* Not the boot CPU */
+	if (found < 0)
+		return 0;
+
 	DBG("boot cpu: logical %d physical %d\n", found,
 	    be32_to_cpu(intserv[found_thread]));
 	boot_cpuid = found;
-		set_hard_smp_processor_id(found,
-			be32_to_cpu(intserv[found_thread]));
+	set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 
 	/*
 	 * PAPR defines "logical" PVR values for cpus that
@@ -373,7 +375,6 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 		identify_cpu(0, be32_to_cpup(prop));
 
 	identical_pvr_fixup(node);
-	}
 
 	check_cpu_feature_properties(node);
 	check_cpu_pa_features(node);
@@ -385,7 +386,6 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 	else
 		cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 #endif
-
 	return 0;
 }