[POWERPC] sysfs: add support for adding/removing spu sysfs attributes

This patch adds two functions to create and remove sysfs attributes and
attribute_group to all cpus.  That allows to register sysfs attributes in
a subdirectory like: /sys/devices/system/cpu/cpuX/group_name/what_ever
This will be used by cbe_thermal to group all attributes dealing with
thermal support in one directory.

Signed-of-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index d45a168..cda21a2 100644 (file)
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -299,6 +299,72 @@ static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
        .notifier_call  = sysfs_cpu_notify,
 };
 
+static DEFINE_MUTEX(cpu_mutex);
+
+int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
+{
+       int cpu;
+
+       mutex_lock(&cpu_mutex);
+
+       for_each_possible_cpu(cpu) {
+               sysdev_create_file(get_cpu_sysdev(cpu), attr);
+       }
+
+       mutex_unlock(&cpu_mutex);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
+
+int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
+{
+       int cpu;
+       struct sys_device *sysdev;
+
+       mutex_lock(&cpu_mutex);
+
+       for_each_possible_cpu(cpu) {
+               sysdev = get_cpu_sysdev(cpu);
+               sysfs_create_group(&sysdev->kobj, attrs);
+       }
+
+       mutex_unlock(&cpu_mutex);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
+
+
+void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
+{
+       int cpu;
+
+       mutex_lock(&cpu_mutex);
+
+       for_each_possible_cpu(cpu) {
+               sysdev_remove_file(get_cpu_sysdev(cpu), attr);
+       }
+
+       mutex_unlock(&cpu_mutex);
+}
+EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
+
+void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
+{
+       int cpu;
+       struct sys_device *sysdev;
+
+       mutex_lock(&cpu_mutex);
+
+       for_each_possible_cpu(cpu) {
+               sysdev = get_cpu_sysdev(cpu);
+               sysfs_remove_group(&sysdev->kobj, attrs);
+       }
+
+       mutex_unlock(&cpu_mutex);
+}
+EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
+
+
 /* NUMA stuff */
 
 #ifdef CONFIG_NUMA

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 3fef7d6..f02d71b 100644 (file)
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -33,6 +33,14 @@ struct cpu {
 
 extern int register_cpu(struct cpu *cpu, int num);
 extern struct sys_device *get_cpu_sysdev(unsigned cpu);
+
+extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
+extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
+
+extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
+extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
+
+
 #ifdef CONFIG_HOTPLUG_CPU
 extern void unregister_cpu(struct cpu *cpu);
 #endif