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Message-ID: <20070802020219.GM11166@waste.org> Date: Wed, 1 Aug 2007 21:02:19 -0500 From: Matt Mackall <mpm@...enic.com> To: Jarek Poplawski <jarkao2@...pl> Cc: Gabriel C <nix.or.die@...glemail.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, jason.wessel@...driver.com, amitkale@...syssoft.com, Sam Ravnborg <sam@...nborg.org> Subject: Re: NETPOLL=y , NETDEVICES=n compile error ( Re: 2.6.23-rc1-mm1 ) On Wed, Aug 01, 2007 at 11:59:21AM +0200, Jarek Poplawski wrote: > On Tue, Jul 31, 2007 at 05:05:00PM +0200, Gabriel C wrote: > > Jarek Poplawski wrote: > > > On Tue, Jul 31, 2007 at 12:14:36PM +0200, Gabriel C wrote: > > >> Jarek Poplawski wrote: > > >>> On 28-07-2007 20:42, Gabriel C wrote: > > >>>> 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. > > >>> ... > > >>>> 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 ? > > >>> IMHO, the only logical issue here is netpoll.c mustn't use > > >>> CONFIG_NET_POLL_CONTROLLER code without #ifdef if it doesn't > > >>> add this dependency itself. > > >>> > > >> Well it does if NETDEVICES && if NET_ETHERNET which booth are N when !NETDEVICES is why KGDBOE uses select and not depends on. > > > > > > "does if XXX" means may "use if XXX". > > > > From what I know means only use "if xxx" on !xxx everything inside the "if xxx" is n and "depends on <something inside the if xxx> > > does not work. > > > > ... > > > > menuconfig FOO > > bool "FOO" > > depends on BAR > > default y > > -- help -- > > something > > if FOO > > > > config BAZ > > depends on WHATEVR && !NOT_THIS > > > > menuconfig SOMETHING_ELSE > > .... > > if SOMETHING_ELSE > > > > config BLUBB > > depends on PCI && WHATNOT > > > > endif # SOMETHING_ELSE > > > > config NETPOLL > > def_bool NETCONSOLE > > > > config NETPOLL_TRAP > > bool "Netpoll traffic trapping" > > default n > > depends on NETPOLL > > > > config NET_POLL_CONTROLLER > > def_bool NETPOLL > > > > endif # FOO > > > > Now if you set FOO=n all is gone and your driver have to select whatever it needs from there. > > Probably not exactly so... > > >From drivers/net/Kconfig: > > > # All the following symbols are dependent on NETDEVICES - do not repeat > > # that for each of the symbols. > > if NETDEVICES > > So, according to this netpoll could presume NETDEVICES and > NET_POLL_CONTROLLER are always on. > > But, as you've found, it's possible to select NETPOLL and !NETDEVICES, > so this comment is at least not precise. > > On the other side something like this: > > ... > endif # NETDEVICES > > config NETPOLL > depends on NETDEVICES > def_bool NETCONSOLE > > config NETPOLL_TRAP > bool "Netpoll traffic trapping" > default n > depends on NETPOLL > > config NET_POLL_CONTROLLER > def_bool NETPOLL > depends on NETPOLL > > > seems to select NET_POLL_CONTROLLER after selecting NETPOLL, but > still doesn't check for NETDEVICES dependency. That's odd. Adding Sam to the cc:. > > >> Now KGDBOE just selects NETPOLL and NETPOLL_TRAP. > > >> Adding 'select CONFIG_NET_POLL_CONTROLLER' let kgdboe compiles but the question is does it work without any ethernet card ? > > > > > > Why kgdboe should care what netpoll needs? So, I hope, you are adding > > > this select under config NETPOLL. On the other hand, if NETPOLL should > > > depend on NET_POLL_CONTROLLER there is probably no reason to have them > > > both. > > > > NET_POLL_CONTROLLER has def_bool NETPOLL if NETDEVICES . > > > > Net peoples ping ?:) How about cc:ing the netpoll maintainer? > OK, I wasn't right here: there is no visible reason for both in the > kernel code, but I can imagine there could be some external users of > NET_POLL_CONTROLLER without NETPOLL. I don't know of any. As far as I can tell at this point, NET_POLL_CONTROLLER == NETPOLL. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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