arm64: topology: Initialise default topology state immediately

As a legacy of the way 32 bit ARM did things the topology code uses a null
topology map by default and then overwrites it by mapping cores with no
information to a cluster by themselves later. In order to make it simpler
to reset things as part of recovering from parse failures in firmware
information directly set this configuration on init. A core will always be
its own sibling so there should be no risk of confusion with firmware
provided information.

Change-Id: Ibaa83b2c2fe624b75d82fcb15e91e68eecedf48f
Signed-off-by: Mark Brown <broonie@linaro.org>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Patch-mainline: linux-arm-kernel 5/2/2014, 20:38
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>

arch/arm64/kernel/topology.c

@@ -43,9 +43,6 @@ static void update_siblings_masks(unsigned int cpuid)
 		 * reset it to default behaviour
 		 */
 		pr_debug("CPU%u: No topology information configured\n", cpuid);
-		cpuid_topo->core_id = 0;
-		cpumask_set_cpu(cpuid, &cpuid_topo->core_sibling);
-		cpumask_set_cpu(cpuid, &cpuid_topo->thread_sibling);
 		return;
 	}
 
@@ -87,9 +84,12 @@ void __init init_cpu_topology(void)
 		struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 
 		cpu_topo->thread_id = -1;
-		cpu_topo->core_id =  -1;
+		cpu_topo->core_id = 0;
 		cpu_topo->cluster_id = -1;
+
 		cpumask_clear(&cpu_topo->core_sibling);
+		cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
 		cpumask_clear(&cpu_topo->thread_sibling);
+		cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
 	}
 }