linux-kernel - [patch] drivers/media/video build fix for certain modular builds

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Date:	Fri, 16 May 2008 09:10:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: [patch] drivers/media/video build fix for certain modular builds


testing of the -tip tree found the following missing symbols build bug:

    LD      init/built-in.o
    LD      .tmp_vmlinux1
    drivers/built-in.o: In function `vidioc_g_ctrl':
    radio-maxiradio.c:(.text+0xd3337): undefined reference to `video_devdata'
    drivers/built-in.o: In function `vidioc_g_frequency':
    radio-maxiradio.c:(.text+0xd3368): undefined reference to `video_devdata'
    drivers/built-in.o: In function `vidioc_s_ctrl':
    [...]

which happens if certain media drivers are modular:

    http://redhat.com/~mingo/misc/config-Thu_May_15_18_10_27_CEST_2008.bad

the problem is:

    CONFIG_VIDEO_MEDIA=m
    CONFIG_VIDEO_DEV=y
    CONFIG_RADIO_MAXIRADIO=y
    CONFIG_VIDEO_V4L2=y

Connecting the build dependencies tree from drivers/media/ to 
drivers/media/video/ allows the built-in drivers(s) to pick up the 
CONFIG_VIDEO_DEV=y symbols.

---
 drivers/media/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/media/Makefile
===================================================================
--- linux.orig/drivers/media/Makefile
+++ linux/drivers/media/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the kernel multimedia device drivers.
 #
 
-obj-y := common/
+obj-y := common/ video/
 
 obj-$(CONFIG_VIDEO_MEDIA) += common/
 
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