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

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Date:	Sun, 12 Jul 2015 10:00:36 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bug: Fix build error in V4.2-RC1

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@...inger.net>
Cc: linux-arch@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 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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