[AGP] Export agp3 routines and link to module if needed.

drivers/char/agp/Makefile

@@ -6,9 +6,9 @@
 export-objs := backend.o
 
 agpgart-y := backend.o frontend.o generic.o
+agpgart-$(CONFIG_AGP3) += generic-3.0.o
 agpgart-objs := $(agpgart-y)
 obj-$(CONFIG_AGP) += agpgart.o
-obj-$(CONFIG_AGP3) += generic-3.0.o
 
 obj-$(CONFIG_AGP_INTEL)		+= intel-agp.o
 obj-$(CONFIG_AGP_VIA)		+= via-agp.o

drivers/char/agp/generic-3.0.c

 #include <linux/list.h>
 #include <linux/pci.h>
 #include <linux/agp_backend.h>
+#include <linux/module.h>
 
 #include "agp.h"
 
@@ -549,3 +550,5 @@ int agp_generic_agp_3_0_enable(u32 mode)
 	return FALSE;
 }
 
+EXPORT_SYMBOL(agp_generic_agp_3_0_enable);
+