On 9/20/21 2:17 PM, Arnd Bergmann wrote:

From: Arnd Bergmann arnd@arndb.de

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

Thanks, Helge

---

arch/parisc/include/asm/agp.h | 4 ++-- arch/powerpc/include/asm/agp.h | 4 ++-- arch/sparc/include/asm/agp.h | 6 +++--- 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/parisc/include/asm/agp.h b/arch/parisc/include/asm/agp.h index cb04470e63d0..14ae54cfd368 100644 --- 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 b29b1186f819..6b6485c988dd 100644 --- 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 efe0d6a12e5a..2d0ff84cee3f 100644 --- 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) \