linux-kernel - [PATCH] netconsole: Fix strange kconfig dependency on configfs

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Date:	Thu, 10 Mar 2011 21:44:51 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Joel Becker <jlbec@...lplan.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	James Bottomley <James.Bottomley@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] netconsole: Fix strange kconfig dependency on configfs

Doing ktest rand config tests, I hit the following build bug:

  LD      .tmp_vmlinux1
drivers/built-in.o: In function `netconsole_target_get':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:127: undefined reference to `config_item_get'
drivers/built-in.o: In function `netconsole_target_put':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:133: undefined reference to `config_item_put'
drivers/built-in.o: In function `netconsole_target_get':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:127: undefined reference to `config_item_get'
drivers/built-in.o: In function `netconsole_target_put':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:133: undefined reference to `config_item_put'
drivers/built-in.o: In function `drop_netconsole_target':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:634: undefined reference to `config_item_put'
drivers/built-in.o: In function `make_netconsole_target':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:607: undefined reference to `config_item_init_type_name'
drivers/built-in.o: In function `dynamic_netconsole_init':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:109: undefined reference to `config_group_init'
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:111: undefined reference to `configfs_register_subsystem'
drivers/built-in.o: In function `dynamic_netconsole_exit':
/home/rostedt/work/autotest/nobackup/linux-test.git/drivers/net/netconsole.c:116: undefined reference to `configfs_unregister_subsystem'
make[1]: *** [.tmp_vmlinux1] Error 1

The .config had the following settings:

CONFIG_CONFIGFS_FS=m
CONFIG_NETCONSOLE=y
CONFIG_NETCONSOLE_DYNAMIC=y

NETCONSOLE_DYNAMIC depends on NETCONSOLE and CONFIGFS_FS, but
NETCONSOLE_DYNAMIC is just a boolean and not a tristate, where both
NETCONSOLE and CONFIGFS_FS are tristates and can be built as modules.

As we can see from the resulting config, NETCONSOLE_DYNAMIC can be set
to be builtin when CONFIGFS_FS which it depends on is built as a module.

The simplest solution is not to allow NETCONSOLE_DYNAMIC be enabled if
CONFIGFS_FS is a module but NETCONSOLE is built in, as
NETCONSOLE_DYNAMIC depends on code that is only compiled in when
CONFIGFS_FS is set.

Cc: Michal Marek <mmarek@...e.cz>
Cc: Nicholas A. Bellinger <nab@...ux-iscsi.org>
Cc: Joel Becker <jlbec@...lplan.org>
Cc: Randy Dunlap <randy.dunlap@...cle.com>
CC: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

---
 drivers/net/Kconfig |    1 +
 1 file changed, 1 insertion(+)

Index: linux-test.git/drivers/net/Kconfig
===================================================================
--- linux-test.git.orig/drivers/net/Kconfig	2011-03-10 18:19:54.644008709 -0500
+++ linux-test.git/drivers/net/Kconfig	2011-03-10 18:21:21.320194133 -0500
@@ -3390,6 +3390,7 @@ config NETCONSOLE
 config NETCONSOLE_DYNAMIC
 	bool "Dynamic reconfiguration of logging targets"
 	depends on NETCONSOLE && SYSFS && CONFIGFS_FS
+	depends on !(NETCONSOLE=y && CONFIGFS_FS=m)
 	help
 	  This option enables the ability to dynamically reconfigure target
 	  parameters (interface, IP addresses, port numbers, MAC addresses)


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