Messages in this thread Patch in this message | | | From | Neil Zhang <> | Subject | [PATCH] drivers: base: update cpu offline info when do hotplug | Date | Mon, 20 Oct 2014 11:29:08 +0800 |
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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 <zhangwm@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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