On 04/25, Thomas Gleixner wrote:
> Provide a simple sysfs interface for the clockevent devices. Show the
> current active clockevent device.
>
Neat. Does this do anything about clockevents that aren't in use
for the tick devices or broadcast device?
> Index: tip/kernel/time/clockevents.c
> ===================================================================
> --- tip.orig/kernel/time/clockevents.c
> +++ tip/kernel/time/clockevents.c
> @@ -460,4 +461,89 @@ void clockevents_notify(unsigned long re
> raw_spin_unlock_irqrestore(&clockevents_lock, flags);
> }
> EXPORT_SYMBOL_GPL(clockevents_notify);
> +
> +#ifdef CONFIG_SYSFS
> +struct bus_type clockevents_subsys = {
> + .name = "clockevents",
> + .dev_name = "clockevent",
> +};
> +
> +static DEFINE_PER_CPU(struct device, tick_percpu_dev);
> +static struct tick_device *tick_get_tick_dev(struct device *dev);
> +
> +static ssize_t sysfs_show_current_tick_dev(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tick_device *td;
> + ssize_t count = 0;
> +
> + raw_spin_lock_irq(&clockevents_lock);
> + td = tick_get_tick_dev(dev);
> + if (td && td->evtdev)
> + count = snprintf(buf, PAGE_SIZE, "%s\n", td->evtdev->name);
> + raw_spin_unlock_irq(&clockevents_lock);
> + return count;
> +}
> +static DEVICE_ATTR(current_device, 0444, sysfs_show_current_tick_dev, NULL);
> +
> +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
> +static struct device tick_bc_dev = {
> + .init_name = "broadcast",
> + .id = 0,
> + .bus = &clockevents_subsys,
> +};
> +
> +static struct tick_device *tick_get_tick_dev(struct device *dev)
> +{
> + return dev == &tick_bc_dev ? tick_get_broadcast_device() :
> + &per_cpu(tick_cpu_device, dev->id);
> +}
> +
> +static int tick_broadcast_init_sysfs(void)
__init?
> +{
> + int err = device_register(&tick_bc_dev);
> +
> + if (!err)
> + err = device_create_file(&tick_bc_dev,
> &dev_attr_current_device);
> + return err;
> +}
> +#else
> +static struct tick_device *tick_get_tick_dev(struct device *dev)
> +{
> + return &per_cpu(tick_cpu_device, dev->id);
> +}
> +static inline int tick_broadcast_init_sysfs(void) { return 0; }
> #endif
> +
> +int __init tick_init_sysfs(void)
static?
> +{
> + int cpu;
> +
> + for_each_possible_cpu(cpu) {
> + struct device *dev = &per_cpu(tick_percpu_dev, cpu);
> + int err;
> +
> + dev->id = cpu;
> + dev->bus = &clockevents_subsys;
> + err = device_register(dev);
> + if (!err)
> + err = device_create_file(dev, &dev_attr_current_device);
> + if (err)
> + return err;
> + }
> + return tick_broadcast_init_sysfs();
> +}
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