[PATCH] PNP: export pnp_bus_type

The PNP framework doesn't export "pnp_bus_type", which is an unfortunate
exception to the policy followed by pretty much every other bus.  I noticed
this when I had to find a device in order to provide its platform_data.

Note that per advice from Arjan, the "export" scope has been been minimized to
avoid the hundred-plus bytes needed to support access from modules.  In this
case, the symbol is only needed by statically linked kernel code that lives
outside the drivers/pnp directory.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Adam Belay <ambx1@neo.rr.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/pnp/base.h

-extern struct bus_type pnp_bus_type;
 extern spinlock_t pnp_lock;
 void *pnp_alloc(long size);
 int pnp_interface_attach_device(struct pnp_dev *dev);

include/linux/pnp.h

@@ -352,6 +352,8 @@ struct pnp_protocol {
 	(dev) = protocol_to_pnp_dev((dev)->protocol_list.next))
 
 
+extern struct bus_type pnp_bus_type;
+
 #if defined(CONFIG_PNP)
 
 /* device management */