[PATCH] bug: Fix build error in V4.2-RC1

[Larry Finger]

If CONFIG_BUG is not defined, then macro __WARN is not defined. This shows
as the following build error:

  CC [M]  drivers/media/v4l2-core/videobuf2-core.o
drivers/media/v4l2-core/videobuf2-core.c: In function âvb2_warn_zero_bytesusedâ:
drivers/media/v4l2-core/videobuf2-core.c:1253:2: error: implicit declaration of function â__WARNâ [-Werror=implicit-function-declaration]
  __WARN();
  ^
This problem has been bisected to commit 77a3c6fd90c94f635edb00d4a65f485687538791.

Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 include/asm-generic/bug.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 630dd23..c1cb4b3 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -137,6 +137,7 @@ extern void warn_slowpath_null(const char *file, const int line);
 })
 
 #else /* !CONFIG_BUG */
+#define __WARN() do {} while (1)
 #ifndef HAVE_ARCH_BUG
 #define BUG() do {} while (1)
 #endif
-- 
2.1.4

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