Messages in this thread | | | Date | Thu, 22 Dec 2005 16:16:43 -0800 | From | Greg KH <> | Subject | Re: [PATCH v2:3/3]Export cpu topology by sysfs |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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