cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / cpu.c

diff --git a/kernel/cpu.c b/kernel/cpu.c
index cfb1d43ab801b69f24c47c0cdb17332c25f6f99e..a1ac7ea245d7ba96727ae3647552564cefab120d 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -64,6 +64,8 @@ void __init cpu_hotplug_init(void)
        cpu_hotplug.refcount = 0;
 }
 
+cpumask_t cpu_active_map;
+
 #ifdef CONFIG_HOTPLUG_CPU
 
 void get_online_cpus(void)
@@ -291,11 +293,20 @@ int __ref cpu_down(unsigned int cpu)
        int err = 0;
 
        cpu_maps_update_begin();
-       if (cpu_hotplug_disabled)
+
+       if (cpu_hotplug_disabled) {
                err = -EBUSY;
-       else
-               err = _cpu_down(cpu, 0);
+               goto out;
+       }
+
+       cpu_clear(cpu, cpu_active_map);
+
+       err = _cpu_down(cpu, 0);
+
+       if (cpu_online(cpu))
+               cpu_set(cpu, cpu_active_map);
 
+out:
        cpu_maps_update_done();
        return err;
 }
@@ -355,11 +366,18 @@ int __cpuinit cpu_up(unsigned int cpu)
        }
 
        cpu_maps_update_begin();
-       if (cpu_hotplug_disabled)
+
+       if (cpu_hotplug_disabled) {
                err = -EBUSY;
-       else
-               err = _cpu_up(cpu, 0);
+               goto out;
+       }
 
+       err = _cpu_up(cpu, 0);
+
+       if (cpu_online(cpu))
+               cpu_set(cpu, cpu_active_map);
+
+out:
        cpu_maps_update_done();
        return err;
 }