Re: [PATCH] agp: define proper stubs for empty helpers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 9/20/21 2:17 PM, Arnd Bergmann wrote:
From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxx>

Acked-by: Helge Deller <deller@xxxxxx> # 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)		\






[Index of Archives]     [Linux SoC]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux