1 files changed, 16 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 68034bbf2e4f..981360509172 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -466,7 +466,20 @@ out:
         return id;
 }
 
-/* Must be called when no change can occur to cpu_present_mask,
+/* Helper routines for cpu to core mapping */
+int cpu_core_index_of_thread(int cpu)
+{
+        return cpu >> threads_shift;
+}
+EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);
+
+int cpu_first_thread_of_core(int core)
+{
+        return core << threads_shift;
+}
+EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);
+
+/* Must be called when no change can occur to cpu_present_map,
  * i.e. during cpu online or offline.
  */
 static struct device_node *cpu_to_l2cache(int cpu)
@@ -514,7 +527,7 @@ int __devinit start_secondary(void *unused)
         notify_cpu_starting(cpu);
         set_cpu_online(cpu, true);
         /* Update sibling maps */
-        base = cpu_first_thread_in_core(cpu);
+        base = cpu_first_thread_sibling(cpu);
         for (i = 0; i < threads_per_core; i++) {
                 if (cpu_is_offline(base + i))
                         continue;
@@ -600,7 +613,7 @@ int __cpu_disable(void)
                 return err;
 
         /* Update sibling maps */
-        base = cpu_first_thread_in_core(cpu);
+        base = cpu_first_thread_sibling(cpu);
         for (i = 0; i < threads_per_core; i++) {
                 cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i));
                 cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu));