linux-kernel - Re: [PATCH][RFC] check for select dependency errors on config load

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Date:	Fri, 20 Feb 2009 21:58:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-kbuild@...r.kernel.org,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, zippel@...ux-m68k.org,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH][RFC] check for select dependency errors on config load

On Sat, 21 Feb 2009 00:24:05 -0500 (EST) Steven Rostedt <rostedt@...dmis.org> wrote:

> There's been a few problems with SELECT and dependencies lately.
> I've been burnt by it a few times myself. So I look at the kconfig
> code and added this patch. It can use a bit more work but it does what
> I want.
> 
> When the config is loaded, it checks all the symbols that are
> selected by an active config and makes sure the visible dependencies are 
> also activated. This should probably be moved to the writing of the 
> config instead, but since I just wanted to see if my current config was 
> OK, I did it on load. This is an RFC patch anyway, so fixes/comments are 
> definitely welcome.
> 
> Here's what I get with the attached config running on 2.6.29-rc5.
> 
> $ make menuconfig
> scripts/kconfig/mconf arch/x86/Kconfig
> .config:2561:warning: MICROCODE selects FW_LOADER which fails its dependencies!
> .config:2561:warning: MICROCODE_INTEL selects FW_LOADER which fails its dependencies!
> .config:2561:warning: PCMCIA_LOAD_CIS selects FW_LOADER which fails its dependencies!
> .config:2561:warning: SCSI_SAS_LIBSAS selects SCSI_SAS_ATTRS which fails its dependencies!
> .config:2561:warning: SCSI_AIC94XX selects FW_LOADER which fails its dependencies!
> .config:2561:warning: KEYBOARD_ATKBD selects SERIO which fails its dependencies!
> .config:2561:warning: KEYBOARD_ATKBD selects SERIO_LIBPS2 which fails its dependencies!
> .config:2561:warning: KEYBOARD_ATKBD selects SERIO_I8042 which fails its dependencies!
> .config:2561:warning: MOUSE_PS2 selects SERIO which fails its dependencies!
> .config:2561:warning: MOUSE_PS2 selects SERIO_LIBPS2 which fails its dependencies!
> .config:2561:warning: MOUSE_PS2 selects SERIO_I8042 which fails its dependencies!
> .config:2561:warning: VT selects INPUT which fails its dependencies!
> .config:2561:warning: DRM selects I2C_ALGOBIT which fails its dependencies!
> .config:2561:warning: SND_EMU10K1 selects FW_LOADER which fails its dependencies!

Well damn, that looks like a major contribution to the general
well-being.

Sam, could you please give this a scan and merge it into linux-next via
your tree?

I wonder how hard it would be to print out the reason why (for example)
FW_LOADER failed its dependencies?

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