linux-kernel - Re: how to handle indirect kconfig dependencies

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Message-Id: <20061125194654.2391db44.randy.dunlap@oracle.com>
Date:	Sat, 25 Nov 2006 19:46:54 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	zippel@...ux-m68k.org, jejb <james.bottomley@...eleye.com>
Subject: Re: how to handle indirect kconfig dependencies

On Thu, 16 Nov 2006 20:07:41 -0800 Randy Dunlap wrote:

> Hi,
> 
> I have a (randconfig) build of 2.6.19-rc5-mm2 with:
> 
> CONFIG_DEBUG_READAHEAD=y
> 
> which selects DEBUG_FS, so DEBUG_FS=y, but DEBUG_FS depends on
> SYSFS, and SYSFS is not set in the randconfig.
> 
> This randconfig causes this build error:
> 
> fs/built-in.o: In function `debugfs_init':
> inode.c:(.init.text+0xdb2): undefined reference to `kernel_subsys'
> 
> so the question is:
> (How) can kconfig follow the dependency chain and either
> - prevent this odd config combination or
> - see that 'select DEBUG_FS' implies 'select SYSFS' and then enable SYSFS
> ?
> 
> I don't believe that the right answer is to add
> 	depends on SYSFS
> to DEBUG_READAHEAD.
> 
> 
> .config is at http://oss.oracle.com/~rdunlap/configs/config-readahead-debugfs

Roman,
Here's another one for your consideration.

USB_APPLEDISPLAY selects BACKLIGHT_LCD_SUPPORT & BACKLIGHT_CLASS_DEVICE;
drivers/backlight/Kconfig depends on SYSFS (but SYSFS=n)

http://oss.oracle.com/~rdunlap/configs/config-backlight-appledisplay

---
~Randy
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