linux-kernel - Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev

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Message-ID: <20090812134440.GA28839@kroah.com>
Date:	Wed, 12 Aug 2009 06:44:40 -0700
From:	Greg KH <greg@...ah.com>
To:	David Dillow <dave@...dillows.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Greg KH <gregkh@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jan Blunck <jblunck@...e.de>, Harald Hoyer <harald@...hat.com>,
	Scott James Remnant <scott@...ntu.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based
 /dev

On Wed, Aug 12, 2009 at 08:56:53AM -0400, David Dillow wrote:
> On Tue, 2009-08-11 at 17:34 -0700, Greg KH wrote:
> > On Tue, Aug 11, 2009 at 08:25:27PM -0400, David Dillow wrote:
> > > So use Eric/Arjan's program that does it in 60ms -- you get a
> > > dynamic /dev, no initrd, fast boot, and no kernel changes required.
> > 
> > Their program only handles it for a reconstruction of /dev based on
> > sysfs one time at boot.  It does not handle things that are added or
> > discovered by the system after that, you need udev for that.
> > 
> > So it's a great hack for boot time stuff, but not a complete /dev
> > management replacement like this code can be for numerous systems.
> 
> What systems would those be?

Rescue disks, Embedded systems with no local users, servers with no
local users, etc.  Basically anything that you are only root on, and
don't care about group permissions.

thanks,

greg k-h
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