Re: [PATCH v2:3/3]Export cpu topology by sysfs

Greg KH
2005-12-23T00:16:43Z

On Tue, Dec 20, 2005 at 06:09:29PM -0800, Yanmin Zhang wrote:
> --- linux-2.6.15-rc5/drivers/base/topology.c 1970-01-01 08:00:00.000000000 +0800
> +++ linux-2.6.15-rc5_topology/drivers/base/topology.c 2005-12-20 00:33:49.000000000 +0800
> @@ -0,0 +1,201 @@
> +/*
> + * driver/base/topology.c - Populate driverfs with cpu topology information

driverfs? Where did you cut/paste this code from?

And why does it have to be in driver/base?

> +struct _topology_attr {
> + struct attribute attr;
> + ssize_t (*show)(int cpu, char *);
> + ssize_t (*store)(const char *, size_t count);
> +};

Don't put a '_' at the beginning of a structure please.

> +static ssize_t topology_show(struct kobject * kobj, struct attribute * attr, char * buf)
> +{
> + unsigned int cpu;
> + struct _topology_attr *fattr = to_attr(attr);
> + ssize_t ret;
> +
> + cpu = container_of(kobj->parent, struct sys_device, kobj)->id;
> + ret = fattr->show ? fattr->show(cpu, buf): 0;
> + return ret;
> +}

Mix of spaces and tabs :(

> +static ssize_t topology_store(struct kobject * kobj, struct attribute * attr,
> + const char * buf, size_t count)
> +{
> + return 0;
> +}

Why is this function even needed?

> +static struct sysfs_ops topology_sysfs_ops = {
> + .show = topology_show,
> + .store = topology_store,
> +};
> +
> +static struct kobj_type topology_ktype = {
> + .sysfs_ops = &topology_sysfs_ops,
> + .default_attrs = topology_default_attrs,
> +};
> +
> +/* Add/Remove cpu_topology interface for CPU device */
> +static int __cpuinit topology_add_dev(struct sys_device * sys_dev)
> +{
> + unsigned int cpu = sys_dev->id;
> +
> + memset(&cpu_topology_kobject[cpu], 0, sizeof(struct kobject));
> +
> + cpu_topology_kobject[cpu].parent = &sys_dev->kobj;
> + kobject_set_name(&cpu_topology_kobject[cpu], "%s", "topology");
> + cpu_topology_kobject[cpu].ktype = &topology_ktype;
> +
> + return kobject_register(&cpu_topology_kobject[cpu]);
> +}

Can't you just use an attribute group and attach it to the cpu kobject?
That would save an array of kobjects I think.

> +static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
> + unsigned long action, void *hcpu)
> +{
> + unsigned int cpu = (unsigned long)hcpu;
> + struct sys_device *sys_dev;
> +
> + sys_dev = get_cpu_sysdev(cpu);
> + switch (action) {
> + case CPU_ONLINE:
> + topology_add_dev(sys_dev);
> + break;
> +#ifdef CONFIG_HOTPLUG_CPU
> + case CPU_DEAD:
> + topology_remove_dev(sys_dev);
> + break;
> +#endif

Why ifdef? Isn't it safe to just always have this in?

thanks,

greg k-h