linux-kernel - Re: [PATCH] documentation: make it clear that sysfs is optional

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Message-ID: <alpine.DEB.2.01.0908010157150.5831@bogon.housecafe.de>
Date:	Sat, 1 Aug 2009 02:14:47 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	Greg KH <gregkh@...e.de>
cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Lucian Adrian Grijincu <lgrijincu@...acom.com>
Subject: Re: [PATCH] documentation: make it clear that sysfs is optional

On Mon, 27 Jul 2009 at 09:26, Greg KH wrote:
> Probably the same reason /proc is configurable.  No one ever turns it
> off, but hey, it's possible :)

Hm, it seems as we cannot turn off PROC_FS or SYSFS any more. At least on 
my system a "make allnoconfig" still selects both. While PROC_FS still 
shows up under Filesystems->Pseudo-Filesystem (but cannot be turned off), 
I don't see a menuconfig knob to turn off SYSFS.
However, "make allnoconfig" still selects quite a few options anyway:

# uname -m
x86_64
# make allnoconfig
# grep -c =y .config
175

(manually editing .config gets reverted on another "make config").

So, it loks like SYSFS is just one of the things needed to build a kernel, 
along with the ~170 other things, at least on x86_64. Is this "make it 
clear that sysfs is optional" patch still valid? :-)

Christian.

sid$ find . -name Kconfig | xargs grep SYSFS  | egrep -v 'drivers/|fs/|net/'
./arch/arm/mach-pxa/Kconfig:    select GPIO_SYSFS
./arch/powerpc/kvm/Kconfig:     depends on KVM && MARKERS && SYSFS
./arch/x86/kvm/Kconfig: depends on KVM && SYSFS
./init/Kconfig:config SYSFS_DEPRECATED
./init/Kconfig:config SYSFS_DEPRECATED_V2
./init/Kconfig: depends on SYSFS
./init/Kconfig: select SYSFS_DEPRECATED
./init/Kconfig: depends on SLUB && SYSFS
./kernel/trace/Kconfig: depends on SYSFS
./security/Kconfig:     depends on SYSFS

-- 
BOFH excuse #228:

That function is not currently supported, but Bill Gates assures us it will be featured in the next upgrade.
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