The current per-cpu offline info won't be updated if it is
hotplugged in/out by a kernel governer.
Let's update it via cpu notifier.
Signed-off-by: Neil Zhang <zhan...@marvell.com>
---
drivers/base/cpu.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 006b1bc..9d61824 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -418,10 +418,35 @@ static void __init cpu_dev_register_generic(void)
#endif
}
+static int device_hotplug_notifier(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+ struct device *dev = get_cpu_device(cpu);
+ int ret;
+
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_ONLINE:
+ dev->offline = false;
+ ret = NOTIFY_OK;
+ break;
+ case CPU_DYING:
+ dev->offline = true;
+ ret = NOTIFY_OK;
+ break;
+ default:
+ ret = NOTIFY_DONE;
+ break;
+ }
+
+ return ret;
+}
+
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");
cpu_dev_register_generic();
+ cpu_notifier(device_hotplug_notifier, 0);
}
--
1.7.9.5
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