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Re: [PATCH -mm] rt2x00: fix Kconfig dependencies

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On Wed, 24 Sep 2008 00:09:31 +0200 Ivo van Doorn wrote:

> On Tuesday 23 September 2008, Larry Finger wrote:
> > Randy Dunlap wrote:
> > > On Tue, 23 Sep 2008 19:51:00 +0200 Ivo van Doorn wrote:
> > > 
> > >> On Tuesday 23 September 2008, Randy Dunlap wrote:
> > >>> Ivo van Doorn wrote:
> > >>>> On Tuesday 23 September 2008, Randy Dunlap wrote:
> > >>>>> From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
> > >>>>>
> > >>>>> If RT2X00=y but RFKILL=m, these build errors happen:
> > >>>>>
> > >>>>> (.text+0x7c7d6): undefined reference to `rfkill_free'
> > >>>>> rt2x00rfkill.c:(.text+0x7c830): undefined reference to `rfkill_force_state'
> > >>>>> (.text+0x7c88d): undefined reference to `rfkill_unregister'
> > >>>>> (.text+0x7c8cd): undefined reference to `rfkill_register'
> > >>>>> (.text+0x7ca1a): undefined reference to `rfkill_allocate'
> > >>>>>
> > >>>>> so restrict RT2X00's RFKILL config level to that of the main RFKILL option.
> > >>>>> This is done by making the former a tristate instead of a bool
> > >>>>> config option.
> > >>>>>
> > >>>>>
> > >>>>> If RT2X00=y but LEDS_CLASS=m, these build errors happen:
> > >>>>>
> > >>>>> (.text+0x11859f): undefined reference to `led_classdev_resume'
> > >>>>> (.text+0x1185b3): undefined reference to `led_classdev_resume'
> > >>>>> (.text+0x1185c7): undefined reference to `led_classdev_resume'
> > >>>>> (.text+0x1185e4): undefined reference to `led_classdev_suspend'
> > >>>>> (.text+0x1185f8): undefined reference to `led_classdev_suspend'
> > >>>>> (.text+0x11860c): undefined reference to `led_classdev_suspend'
> > >>>>> rt2x00leds.c:(.text+0x118620): undefined reference to `led_classdev_unregister'
> > >>>>> rt2x00leds.c:(.text+0x118695): undefined reference to `led_classdev_register'
> > >>>>>
> > >>>>> so restrict RT2X00's LEDS config level to that of the main LEDS_CLASS option.
> > >>>>> This is done by making the former a tristate instead of a bool
> > >>>>> config option.
> > >>>> Is that really going to work correctly?
> > >>>> rfkill and leds support should be compiled into rt2x00lib.ko, which means that
> > >>>> should become a module instead of the rfkill/leds support part only.
> > >>> I wondered about that lib.ko.  Any working build fix is OK with me.
> > >>> What do you suggest?
> > >> Actually I was hoping that you answer to my question was going to be "yes it will be working correctly" ;)
> > >>
> > >> Would this work?
> > >>
> > >> config RT2X00_LIB_RFKILL
> > >> 	tristate
> > >>   	depends on RFKILL
> > >>   	default y
> > >>   
> > >> config RT2X00_LIB_LEDS
> > >> 	tristate
> > >>   	depends on NEW_LEDS
> > >>   	depends on LEDS_CLASS
> > >> 	default y
> > >>
> > >> config RT2X00_LIB
> > >> 	tristate
> > >> 	depends on RT2X00_LIB_RFKILL if (RT2X00_LIB_RFKILL != n)
> > >> 	depends on RT2X00_LIB_LEDS if (RT2X00_LIB_LEDS != n)
> > >>
> > >> It's ugly, and I can't test this right now, but perhaps you have an idea if this could do the trick?
> > > 
> > > I tried it:
> > > 
> > > drivers/net/wireless/rt2x00/Kconfig:22: invalid option
> > > drivers/net/wireless/rt2x00/Kconfig:23: invalid option
> > > 
> > > "depends ... if ..." is invalid.  Would be nice to have that.
> > > Maybe there is some other way to express that...
> > 
> > Wouldn't this do it?
> > 
> > depends on (RT2X00_LIB_RFKILL == m) || (RT2X00_LIB_RFKILL == y)
> > 
> > In b43, what I think is a similar configuration statement is written as
> > 
> > depends on B43 && (RFKILL = y || RFKILL = B43) && RFKILL_INPUT &&
> > (INPUT_POLLDEV = y || INPUT_POLLDEV = B43)
> 
> Wouldn't that completely disable the config option when the rfkill is build
> as module and b43 buildin? I think what you want in that scenario would be

Yes, it does.

> building b43 as module instead.
> On the other hand, such Kconfig expression is apparently not possible,
> which means your approach would be the closest match.

Ivo, please explain what rt2x00 module(s) you want to be built.  In English
if possible, not in Kconfig language...

Thanks.

---
~Randy
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