netdev - Re: [PATCH] netconsole: fix build when CONFIG_NETCONSOLE

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Message-ID: <4E00A544.6020105@oracle.com>
Date:	Tue, 21 Jun 2011 07:05:56 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, davem@...emloft.net,
	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	hilld@...arystorm.net
Subject: Re: [PATCH] netconsole: fix build when CONFIG_NETCONSOLE_DYNAMIC
 is turned on

On 06/21/11 05:45, Ben Hutchings wrote:
> On Mon, 2011-06-20 at 21:25 -0700, Randy Dunlap wrote:
>> From: Randy Dunlap <randy.dunlap@...cle.com>
>>
>> When NETCONSOLE_DYNAMIC=y and CONFIGFS_FS=m, there are build errors
>> in netconsole:
>>
>> drivers/built-in.o: In function `drop_netconsole_target':
>> netconsole.c:(.text+0x1a100f): undefined reference to `config_item_put'
>> drivers/built-in.o: In function `make_netconsole_target':
>> netconsole.c:(.text+0x1a10b9): undefined reference to `config_item_init_type_name'
>> drivers/built-in.o: In function `write_msg':
>> netconsole.c:(.text+0x1a11a4): undefined reference to `config_item_get'
>> netconsole.c:(.text+0x1a1211): undefined reference to `config_item_put'
>> drivers/built-in.o: In function `netconsole_netdev_event':
>> netconsole.c:(.text+0x1a12cc): undefined reference to `config_item_put'
>> netconsole.c:(.text+0x1a12ec): undefined reference to `config_item_get'
>> netconsole.c:(.text+0x1a1366): undefined reference to `config_item_put'
>> drivers/built-in.o: In function `init_netconsole':
>> netconsole.c:(.init.text+0x953a): undefined reference to `config_group_init'
>> netconsole.c:(.init.text+0x9560): undefined reference to `configfs_register_subsystem'
>> drivers/built-in.o: In function `dynamic_netconsole_exit':
>> netconsole.c:(.exit.text+0x809): undefined reference to `configfs_unregister_subsystem'
>>
>> so make NETCONSOLE_DYNAMIC require CONFIGFS_FS=y to fix the build errors.
> [...]
> 
> NETCONSOLE is tristate, and I think NETCONSOLE=m && NETCONSOLE_DYNAMIC=y
> && CONFIGFS_FS=m should be OK.
> 
> It seems like Kconfig should have a '>=' operator which behaves like a
> numeric comparison with n=0, m=1, y=2.  Then we could use a dependency
> of:
> 	NETCONSOLE && SYSFS && CONFIGFS_FS>=NETCONSOLE
> 
> But for now I think the correct dependency is:
> 	NETCONSOLE && SYSFS && CONFIGFS_FS && !(NETCONSOLE=y && CONFIGFS_FS=m)

or just have NETCONSOLE_DYNAMIC select CONFIGFS_FS instead of depend on it.

-- 
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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