[AGPGART] Move [un]map_page_into_agp into asm/agp.h

Remove an arch-dependent hunk in favor of #define-ing the respective bits in
asm-<arch>/agp.h (allowing easier overriding in para-virtualized environments).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/generic.c

@@ -51,28 +51,6 @@ int agp_memory_reserved;
  */
 EXPORT_SYMBOL_GPL(agp_memory_reserved);
 
-#if defined(CONFIG_X86)
-int map_page_into_agp(struct page *page)
-{
-	int i;
-	i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
-	/* Caller's responsibility to call global_flush_tlb() for
-	 * performance reasons */
-	return i;
-}
-EXPORT_SYMBOL_GPL(map_page_into_agp);
-
-int unmap_page_from_agp(struct page *page)
-{
-	int i;
-	i = change_page_attr(page, 1, PAGE_KERNEL);
-	/* Caller's responsibility to call global_flush_tlb() for
-	 * performance reasons */
-	return i;
-}
-EXPORT_SYMBOL_GPL(unmap_page_from_agp);
-#endif
-
 /*
  * Generic routines for handling agp_memory structures -
  * They use the basic page allocation routines to do the brunt of the work.

include/asm-i386/agp.h

@@ -12,8 +12,10 @@
  * data corruption on some CPUs.
  */
 
-int map_page_into_agp(struct page *page);
-int unmap_page_from_agp(struct page *page);
+/* Caller's responsibility to call global_flush_tlb() for
+ * performance reasons */
+#define map_page_into_agp(page) change_page_attr(page, 1, PAGE_KERNEL_NOCACHE)
+#define unmap_page_from_agp(page) change_page_attr(page, 1, PAGE_KERNEL)
 #define flush_agp_mappings() global_flush_tlb()
 
 /* Could use CLFLUSH here if the cpu supports it. But then it would

include/asm-x86_64/agp.h

@@ -10,8 +10,10 @@
  * with different cachability attributes for the same page.
  */
 
-int map_page_into_agp(struct page *page);
-int unmap_page_from_agp(struct page *page);
+/* Caller's responsibility to call global_flush_tlb() for
+ * performance reasons */
+#define map_page_into_agp(page) change_page_attr(page, 1, PAGE_KERNEL_NOCACHE)
+#define unmap_page_from_agp(page) change_page_attr(page, 1, PAGE_KERNEL)
 #define flush_agp_mappings() global_flush_tlb()
 
 /* Could use CLFLUSH here if the cpu supports it. But then it would