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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20070519230537.GI6291@stusta.de>
Date:	Sun, 20 May 2007 01:05:37 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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 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.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

-
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/