Descend into drivers/hotplug only if CONFIG_HOTPLUG_PCI is set.

drivers/Makefile

@@ -9,12 +9,13 @@
 mod-subdirs :=	dio mtd sbus video macintosh usb input telephony sgi ide \
 		message/i2o message/fusion scsi md ieee1394 pnp isdn atm \
 		fc4 net/hamradio i2c acpi bluetooth input/serio \
-		input/gameport parport
+		input/gameport parport hotplug
 
-subdir-y :=	base char block net misc media cdrom hotplug
+subdir-y :=	base char block net misc media cdrom
 subdir-m :=	$(subdir-y)
 
 subdir-$(CONFIG_PARPORT)	+= parport
+subdir-$(CONFIG_HOTPLUG_PCI)	+= hotplug
 subdir-$(CONFIG_DIO)		+= dio
 subdir-$(CONFIG_PCI)		+= pci
 subdir-$(CONFIG_PCMCIA)		+= pcmcia