The description of the basic operations was a bit inconsistent
and based on older version of the patchset.

Also the size of the spinlock structure should be allocated
instead of the pointer.
Signed-off-by: NPetr Mladek <pmladek@suse.com>
Acked-by: NJoe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>