kset: convert kernel_subsys to use kset_create

Dynamically create the kset instead of declaring it statically.  We also
rename kernel_subsys to kernel_kset to catch all users of this symbol
with a build error instead of an easy-to-ignore build warning.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 390ae14..bd741e8 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -194,8 +194,8 @@
 	.uevent_ops =_uevent_ops, \
 }
 
-/* The global /sys/kernel/ subsystem for people to chain off of */
-extern struct kset kernel_subsys;
+/* The global /sys/kernel/ kset for people to chain off of */
+extern struct kset *kernel_kset;
 /* The global /sys/hypervisor/ subsystem  */
 extern struct kset hypervisor_subsys;