char/agp: consolidate {alloc,free}_gatt_pages()

There is a copy of alloc_gatt_pages() and free_gatt_pages in several
architectures in arch/$ARCH/include/asm/agp.h. All the copies do exactly
the same: alias alloc_gatt_pages() to __get_free_pages(GFP_KERNEL) and
alias free_gatt_pages() to free_pages().

Define alloc_gatt_pages() and free_gatt_pages() in drivers/char/agp/agp.h
and drop per-architecture definitions.

Signed-off-by: Mike Rapoport (IBM) <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/alpha/include/asm/agp.h

···
 #define unmap_page_from_agp(page)	do { } while (0)
 #define flush_agp_cache() mb()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif

arch/ia64/include/asm/agp.h

···
 #define unmap_page_from_agp(page)	do { } while (0)
 #define flush_agp_cache()		mb()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif /* _ASM_IA64_AGP_H */

arch/parisc/include/asm/agp.h

···
 #define unmap_page_from_agp(page)	do { } while (0)
 #define flush_agp_cache()		mb()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif /* _ASM_PARISC_AGP_H */

arch/powerpc/include/asm/agp.h

···
 #define unmap_page_from_agp(page) do {} while (0)
 #define flush_agp_cache() mb()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif /* __KERNEL__ */
 #endif	/* _ASM_POWERPC_AGP_H */

arch/sparc/include/asm/agp.h

···
 #define unmap_page_from_agp(page)	do { } while (0)
 #define flush_agp_cache()		mb()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif

arch/x86/include/asm/agp.h

···
  */
 #define flush_agp_cache() wbinvd()
 
-/* GATT allocation. Returns/accepts GATT kernel virtual address. */
-#define alloc_gatt_pages(order)		\
-	((char *)__get_free_pages(GFP_KERNEL, (order)))
-#define free_gatt_pages(table, order)	\
-	free_pages((unsigned long)(table), (order))
-
 #endif /* _ASM_X86_AGP_H */

drivers/char/agp/agp.h

···
 int agp3_generic_configure(void);
 void agp3_generic_cleanup(void);
 
+/* GATT allocation. Returns/accepts GATT kernel virtual address. */
+#define alloc_gatt_pages(order)		\
+	((char *)__get_free_pages(GFP_KERNEL, (order)))
+#define free_gatt_pages(table, order)	\
+	free_pages((unsigned long)(table), (order))
+
 /* aperture sizes have been standardised since v3 */
 #define AGP_GENERIC_SIZES_ENTRIES 11
 extern const struct aper_size_info_16 agp3_generic_sizes[];