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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20070519235116.GO6291@stusta.de>
Date:	Sun, 20 May 2007 01:51:17 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Satyam Sharma <satyam.sharma@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: RFC: kconfig select warnings bogus?

On Sun, May 20, 2007 at 05:11:50AM +0530, Satyam Sharma wrote:
> On 5/20/07, Satyam Sharma <satyam.sharma@...il.com> wrote:
>> On 5/20/07, Adrian Bunk <bunk@...sta.de> wrote:
>> > On Sun, May 20, 2007 at 04:47:52AM +0530, Satyam Sharma wrote:
>> > > On 5/20/07, Adrian Bunk <bunk@...sta.de> wrote:
>> > >> On Sun, May 20, 2007 at 04:19:12AM +0530, Satyam Sharma wrote:
>> > >> >...
>> > >> > A combined patch for all of those on top of 22-rc2 (adding
>> > >> Signed-off-by's
>> > >> > for original authors too):
>> > >> >...
>> > >> > --- a/arch/m68k/Kconfig       2007-05-20 04:11:47.000000000 +0530
>> > >> > +++ b/arch/m68k/Kconfig       2007-05-20 04:23:57.000000000 +0530
>> > >> > @@ -411,6 +411,7 @@ config STRAM_PROC
>> > >> >
>> > >> > config ATARI_KBD_CORE
>> > >> >       bool
>> > >> > +     default y if KEYBOARD_ATARI || MOUSE_ATARI
>> > >> >...
>> > >> > --- a/drivers/input/keyboard/Kconfig  2007-05-20 04:11:55.000000000
>> > >> +0530
>> > >> > +++ b/drivers/input/keyboard/Kconfig  2007-05-20 04:24:54.000000000
>> > >> +0530
>> > >> > @@ -167,7 +167,6 @@ config KEYBOARD_AMIGA
>> > >> > config KEYBOARD_ATARI
>> > >> >       tristate "Atari keyboard"
>> > >> >       depends on ATARI
>> > >> > -     select ATARI_KBD_CORE
>> > >> >       help
>> > >> >         Say Y here if you are running Linux on any Atari and have a
>> > >> keyboard
>> > >> >         attached.
>> > >> > diff -ruNp a/drivers/input/mouse/Kconfig 
>> b/drivers/input/mouse/Kconfig
>> > >> > --- a/drivers/input/mouse/Kconfig     2007-05-20 04:11:55.000000000
>> > >> +0530
>> > >> > +++ b/drivers/input/mouse/Kconfig     2007-05-20 04:25:09.000000000
>> > >> +0530
>> > >> > @@ -179,7 +179,6 @@ config MOUSE_AMIGA
>> > >> > config MOUSE_ATARI
>> > >> >       tristate "Atari mouse"
>> > >> >       depends on ATARI
>> > >> > -     select ATARI_KBD_CORE
>> > >> >       help
>> > >> >         Say Y here if you have an Atari and want its native mouse
>> > >> >         supported by the kernel.
>> > >> >...
>> > >>
>> > >> This is a good example how "fixing" the warnings makes things 
>> worse...
>> > >
>> > > How?
>> >
>> > Consider ATARI_KBD_CORE was used by 20 drivers.
>> >
>> > Using select for such not user visible helper variables is a really nice
>> > thing, and much more readable (and therefore much less likely to contain
>> > bugs) than dependencies with tons of "||"'s.
>>
>> Well, the "default .. if .." kind of idiom is fairly common (I could say
>> almost standard), in arch/.../config's. It's been used for some time,
>> and for several symbols over there. But you're right that if 20 drivers
>> used ATARI_KBD_CORE, we'd get tons of ugly "||"'s there, so
>> perhaps we do need some kind of fix for this.
>
> [ BTW ] I hope nobody gets the wrong message with the word "fix"
> above, what you're pointing out is only a "readability" issue, not a
> potential build breakage or any critical problem ...

And what it would "fix" is only a bogus warning, not a potential build 
breakage or any critical problem ...

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/