powerpc: Pull out cpu_core_mask updates into a separate function

This factors out the details of updating cpu_core_mask into a separate
function, to make it easier to change how the mask is calculated later.
This makes no functional change.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index e692112..0cc69d5 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -631,11 +631,36 @@ static struct device_node *cpu_to_l2cache(int cpu)
        return cache;
 }
 
+static void traverse_core_siblings(int cpu, bool add)
+{
+       struct device_node *l2_cache;
+       const struct cpumask *mask;
+       int i;
+
+       l2_cache = cpu_to_l2cache(cpu);
+       mask = add ? cpu_online_mask : cpu_present_mask;
+       for_each_cpu(i, mask) {
+               struct device_node *np = cpu_to_l2cache(i);
+               if (!np)
+                       continue;
+               if (np == l2_cache) {
+                       if (add) {
+                               cpumask_set_cpu(cpu, cpu_core_mask(i));
+                               cpumask_set_cpu(i, cpu_core_mask(cpu));
+                       } else {
+                               cpumask_clear_cpu(cpu, cpu_core_mask(i));
+                               cpumask_clear_cpu(i, cpu_core_mask(cpu));
+                       }
+               }
+               of_node_put(np);
+       }
+       of_node_put(l2_cache);
+}
+
 /* Activate a secondary processor. */
 void start_secondary(void *unused)
 {
        unsigned int cpu = smp_processor_id();
-       struct device_node *l2_cache;
        int i, base;
 
        atomic_inc(&init_mm.mm_count);
@@ -674,18 +699,7 @@ void start_secondary(void *unused)
                cpumask_set_cpu(cpu, cpu_core_mask(base + i));
                cpumask_set_cpu(base + i, cpu_core_mask(cpu));
        }
-       l2_cache = cpu_to_l2cache(cpu);
-       for_each_online_cpu(i) {
-               struct device_node *np = cpu_to_l2cache(i);
-               if (!np)
-                       continue;
-               if (np == l2_cache) {
-                       cpumask_set_cpu(cpu, cpu_core_mask(i));
-                       cpumask_set_cpu(i, cpu_core_mask(cpu));
-               }
-               of_node_put(np);
-       }
-       of_node_put(l2_cache);
+       traverse_core_siblings(cpu, true);
 
        smp_wmb();
        notify_cpu_starting(cpu);
@@ -741,7 +755,6 @@ int arch_sd_sibling_asym_packing(void)
 #ifdef CONFIG_HOTPLUG_CPU
 int __cpu_disable(void)
 {
-       struct device_node *l2_cache;
        int cpu = smp_processor_id();
        int base, i;
        int err;
@@ -761,20 +774,7 @@ int __cpu_disable(void)
                cpumask_clear_cpu(cpu, cpu_core_mask(base + i));
                cpumask_clear_cpu(base + i, cpu_core_mask(cpu));
        }
-
-       l2_cache = cpu_to_l2cache(cpu);
-       for_each_present_cpu(i) {
-               struct device_node *np = cpu_to_l2cache(i);
-               if (!np)
-                       continue;
-               if (np == l2_cache) {
-                       cpumask_clear_cpu(cpu, cpu_core_mask(i));
-                       cpumask_clear_cpu(i, cpu_core_mask(cpu));
-               }
-               of_node_put(np);
-       }
-       of_node_put(l2_cache);
-
+       traverse_core_siblings(cpu, false);
 
        return 0;
 }