netdev - [PATCH net-2.6.25] [NETNS] change net/Kconfig to avoid a broken build when building with network namesapce support.

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Date:	Tue, 29 Jan 2008 12:53:02 +0200
From:	"Rami Rosen" <ramirose@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH net-2.6.25] [NETNS] change net/Kconfig to avoid a broken build when building with network namesapce support.

Hi,

The build is broken with the following kernel configuration:

- net-2.6.25
- Support for network namespaces enabled (CONFIG_NET_NS=y)
- CONFIG_RCU_TRACE=y
	CONFIG_RCU_TRACE can be set by:
	 make menuconfig ->Processor type and features->Enable tracing for RCU.

- The error in build is :
	  fs/built-in.o: In function `debugfs_init':
	 /work/src/netGit2.6.25/2.6.25/fs/debugfs/inode.c:435: undefined
	 reference to `kernel_kobj'
	 make: *** [.tmp_vmlinux1] Error 1

The reason is : RCU_TRACE selects DEBUG_FS,
 but CONFIG_NET_NS depends on EXPERIMENTAL && !SYSFS;
 debugfs can't be built without sysfs.

 There is currently a bit of mess with SYSFS and in fact it seems that
maybe selecting DEBUG_FS
should depend on SYSFS; to avoid this problem in the build,
 this patch adds !DEBUG_FS to CONFIG_NET_NS dependencies in net/Kconfig.
 This way, if CONFIG_RCU_TRACE is set, ( or other configuration items which
selects DEBUG_FS), we cannot set CONFIG_NET_NS.

Regards,
Rami Rosen

Signed-off-by: Rami Rosen <ramirose@...il.com>

View attachment "patch.txt" of type "text/plain" (397 bytes)