agp: define proper stubs for empty helpers

The empty unmap_page_from_agp() macro causes a warning when
building with 'make W=1' on a couple of architectures:

drivers/char/agp/generic.c: In function 'agp_generic_destroy_page':
drivers/char/agp/generic.c:1265:28: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
 1265 |   unmap_page_from_agp(page);

Change the definitions to a 'do { } while (0)' construct to
make these more reliable.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/include/asm/agp.h b/arch/parisc/include/asm/agp.h
index cb04470..14ae54c 100644 (file)
--- a/arch/parisc/include/asm/agp.h
+++ b/arch/parisc/include/asm/agp.h
@@ -8,8 +8,8 @@
  *
  */
 
-#define map_page_into_agp(page)                /* nothing */
-#define unmap_page_from_agp(page)      /* nothing */
+#define map_page_into_agp(page)                do { } while (0)
+#define unmap_page_from_agp(page)      do { } while (0)
 #define flush_agp_cache()              mb()
 
 /* GATT allocation. Returns/accepts GATT kernel virtual address. */

diff --git a/arch/powerpc/include/asm/agp.h b/arch/powerpc/include/asm/agp.h
index b29b118..6b6485c 100644 (file)
--- a/arch/powerpc/include/asm/agp.h
+++ b/arch/powerpc/include/asm/agp.h
@@ -5,8 +5,8 @@
 
 #include <asm/io.h>
 
-#define map_page_into_agp(page)
-#define unmap_page_from_agp(page)
+#define map_page_into_agp(page) do {} while (0)
+#define unmap_page_from_agp(page) do {} while (0)
 #define flush_agp_cache() mb()
 
 /* GATT allocation. Returns/accepts GATT kernel virtual address. */

diff --git a/arch/sparc/include/asm/agp.h b/arch/sparc/include/asm/agp.h
index efe0d6a..2d0ff84 100644 (file)
--- a/arch/sparc/include/asm/agp.h
+++ b/arch/sparc/include/asm/agp.h
@@ -4,9 +4,9 @@
 
 /* dummy for now */
 
-#define map_page_into_agp(page)
-#define unmap_page_from_agp(page)
-#define flush_agp_cache() mb()
+#define map_page_into_agp(page)                do { } while (0)
+#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)                \