linux-kernel - Re: [patch, -git] media/video/sound build fix, TEA5761/TEA5767

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]

Date:	Wed, 30 Apr 2008 13:54:49 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	mingo@...e.hu, mchehab@...radead.org, akpm@...ux-foundation.org,
	linux-dvb-maintainer@...uxtv.org, video4linux-list@...hat.com,
	linux-kernel@...r.kernel.org, efault@....de
Subject: Re: [patch, -git] media/video/sound build fix, TEA5761/TEA5767

At Wed, 30 Apr 2008 04:17:03 -0700 (PDT),
David Miller wrote:
> 
> From: Takashi Iwai <tiwai@...e.de>
> Date: Wed, 30 Apr 2008 13:11:31 +0200
> 
> > IMO, it's the reverse selection from sound to V4L that makes things
> > complicated.  I believe it's better to fix it as a normal dependency.
> > 
> > How about the patch below?
> 
> The question that remains is what does this mean for users?
> 
> How does a user, who wants to enable this 'sound' driver,
> learn that they must enable the v4l subsystem in order to
> do so?
> 
> This is typically why select constructs are used, to not bother the
> user with such messy details.

Yes, from the usability POV, select is better.

> But like we see in this case, it can cause serious implementation
> problems if not used properly. :(

Indeed.  The problem is that the select doesn't (can't?) resolve the
dependecy in a reverse way.  For example, select VIDEO_V4L1 won't turn
on the dependent items such as VIDEO_DEV, VIDEO_V4L2_COMMON,
VIDEO_ALLOW_V4L1, so and so.

Thus, when another dependency is added to the selected target, it can
easily break the depdency chain like this case...


Takashi
--
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/