linux-kernel - Re: RFC: kconfig select warnings bogus?

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Message-ID: <a781481a0705191617g7709f323p15cbc28fa7603e1c@mail.gmail.com>
Date:	Sun, 20 May 2007 04:47:01 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Adrian Bunk" <bunk@...sta.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Sam Ravnborg" <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Roman Zippel" <zippel@...ux-m68k.org>
Subject: Re: RFC: kconfig select warnings bogus?

On 5/20/07, Adrian Bunk <bunk@...sta.de> wrote:
> On Sat, May 19, 2007 at 11:09:44AM -0700, Andrew Morton wrote:
> > On Sat, 19 May 2007 17:15:23 +0200 Sam Ravnborg <sam@...nborg.org> wrote:
> >
> > > We see a lot of these lately:
> > >   GEN     /home/bor/build/linux-2.6.22/Makefile
> > > scripts/kconfig/conf -s arch/i386/Kconfig
> > > drivers/macintosh/Kconfig:116:warning: 'select' used by config symbol 'PMAC_APM_EMU' refers to undefined symbol 'SYS_SUPPORTS_APM_EMULATION'
> > > drivers/net/Kconfig:2283:warning: 'select' used by config symbol 'UCC_GETH' refers to undefined symbol 'UCC_FAST'
> > > drivers/input/keyboard/Kconfig:170:warning: 'select' used by config symbol 'KEYBOARD_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'
> > > drivers/input/mouse/Kconfig:182:warning: 'select' used by config symbol 'MOUSE_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'
> > >
> > >
> > > Do this warning really add any value or should we just ignore them like this?
> > >
> >
> > They always indicate Kconfig bugs, don't they?  If so, we should keep the
> > warning.
> >...
>
> No, they aren't always.
>
> Look for example at the last one in drivers/input/mouse/Kconfig:
>
> config MOUSE_ATARI
>         tristate "Atari mouse"
>         depends on ATARI
>         select ATARI_KBD_CORE
>
> This is perfectly correct (the select'ed symbol is only unavailable when
> the dependency can't be fulfilled), and all things to "fix" the warning
> will make it worse.

Not sure what you mean here. The select'ed symbol here is unavailable
because not all arch's define it. However, the symbol that selects it is
in drivers/input/... and hence run for all arch's. That's the simple issue
here that is resolved by this fix.
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