1 files changed, 57 insertions, 0 deletions

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
new file mode 100644
index 000000000000..1f064a63f8cf
--- /dev/null
+++ b/kernel/ksysfs.c
@@ -0,0 +1,57 @@
+/*
+ * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
+ *                   are not related to any other subsystem
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * 
+ * This file is release under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#define KERNEL_ATTR_RO(_name) \
+static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
+
+#define KERNEL_ATTR_RW(_name) \
+static struct subsys_attribute _name##_attr = \
+        __ATTR(_name, 0644, _name##_show, _name##_store)
+
+#ifdef CONFIG_HOTPLUG
+static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page)
+{
+        return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
+}
+KERNEL_ATTR_RO(hotplug_seqnum);
+#endif
+
+decl_subsys(kernel, NULL, NULL);
+EXPORT_SYMBOL_GPL(kernel_subsys);
+
+static struct attribute * kernel_attrs[] = {
+#ifdef CONFIG_HOTPLUG
+        &hotplug_seqnum_attr.attr,
+#endif
+        NULL
+};
+
+static struct attribute_group kernel_attr_group = {
+        .attrs = kernel_attrs,
+};
+
+static int __init ksysfs_init(void)
+{
+        int error = subsystem_register(&kernel_subsys);
+        if (!error)
+                error = sysfs_create_group(&kernel_subsys.kset.kobj,
+                                           &kernel_attr_group);
+
+        return error;
+}
+
+core_initcall(ksysfs_init);