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Subject[PATCH V2] bug: Fix build error in V4.2-RC1
Date
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 ‘vb2_warn_zero_bytesused’:
drivers/media/v4l2-core/videobuf2-core.c:1253:2: error: implicit declaration of function ‘__WARN’ [-Werror=implicit-function-declaration]
__WARN();
^
This problem has been bisected to commit 77a3c6fd90c94f635edb00d4a65f485687538791.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---

V2 - Fix infinite loop for __WARN as noted by Joe Perches
---

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 (0)
#ifndef HAVE_ARCH_BUG
#define BUG() do {} while (1)
#endif
--
2.1.4


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