netdev - Re: NETPOLL=y , NETDEVICES=n compile error ( Re: 2.6.23-rc1-mm1 )

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Message-ID: <46AB8DF9.8060903@googlemail.com>
Date:	Sat, 28 Jul 2007 20:42:01 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jason.wessel@...driver.com, amitkale@...syssoft.com
Subject: Re: NETPOLL=y , NETDEVICES=n compile error ( Re: 2.6.23-rc1-mm1 )

Andrew Morton wrote:
> On Sat, 28 Jul 2007 17:44:45 +0200 Gabriel C <nix.or.die@...glemail.com> wrote:
> 
>> Hi,
>>
>> I got this compile error with a randconfig ( http://194.231.229.228/MM/randconfig-auto-82.broken.netpoll.c ).
>>
>> ...
>>
>> net/core/netpoll.c: In function 'netpoll_poll':
>> net/core/netpoll.c:155: error: 'struct net_device' has no member named 'poll_controller'
>> net/core/netpoll.c:159: error: 'struct net_device' has no member named 'poll_controller'
>> net/core/netpoll.c: In function 'netpoll_setup':
>> net/core/netpoll.c:670: error: 'struct net_device' has no member named 'poll_controller'
>> make[2]: *** [net/core/netpoll.o] Error 1
>> make[1]: *** [net/core] Error 2
>> make: *** [net] Error 2
>> make: *** Waiting for unfinished jobs....
>>
>> ...
>>
>>
>> I think is because KGDBOE selects just NETPOLL.
>>
> 
> Looks like it.
> 
> Select went and selected NETPOLL and NETPOLL_TRAP but things like
> CONFIG_NETDEVICES and CONFIG_NET_POLL_CONTROLLER remain unset.  `select'
> remains evil.
> 
> Something like this..
> 
> --- a/lib/Kconfig.kgdb~kgdb-kconfig-fix
> +++ a/lib/Kconfig.kgdb
> @@ -175,8 +175,7 @@ endchoice
>  config KGDBOE
>  	tristate "KGDB: On ethernet" if !KGDBOE_NOMODULE
>  	depends on m && KGDB
> -	select NETPOLL
> -	select NETPOLL_TRAP
> +	depends on NETPOLL_TRAP && NET_POLL_CONTROLLER
>  	help
>  	  Uses the NETPOLL API to communicate with the host GDB via UDP.
>  	  In order for this to work, the ethernet interface specified must
> _
> 
> 


That doesn't fix it. With that patch an 'make oldconfig' all NETPOLL stuff gone and we end up with :

...

drivers/built-in.o: In function `option_setup':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:160: undefined reference to `netpoll_parse_options'
drivers/built-in.o: In function `configure_kgdboe':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:183: undefined reference to `netpoll_setup'
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:189: undefined reference to `netpoll_cleanup'
drivers/built-in.o: In function `eth_post_exception_handler':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:119: undefined reference to `netpoll_set_trap'
drivers/built-in.o: In function `eth_pre_exception_handler':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:111: undefined reference to `netpoll_set_trap'
drivers/built-in.o: In function `eth_flush_buf':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:138: undefined reference to `netpoll_send_udp'
drivers/built-in.o: In function `eth_get_char':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:127: undefined reference to `netpoll_poll'
drivers/built-in.o: In function `cleanup_kgdboe':
/work/crazy/linux-git/MM/linux-2.6.23-rc1/drivers/net/kgdboe.c:217: undefined reference to `netpoll_cleanup'
make: *** [.tmp_vmlinux1] Error 1

...


If I get that right  select is needed here because  all NETPOLL{_*} depends on if NETDEVICES && if NET_ETHERNET.

Also doing 
	
	...
	select NETPOLL_TRAP 
	select NETPOLL
	select NET_POLL_CONTROLLER
	...

makes the driver happy and everything compiles fine.

I think there may be a logical issue ( again if I got it right ).
We need some ethernet card to work with kgdboe right ? but we don't have any if !NETDEVICES && !NET_ETHERNET.

So maybe some ' depends on ... && NETDEVICES!=n && NET_ETHERNET!=n ' is needed too ? 

( really sory if I said something stupid these Kconfig depends are not really easy to figure for me )


Gabriel 
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