linux-kernel - Re: [patch 00/13] devtmpfs patches

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Message-ID: <m1fxfbuyv7.fsf@fess.ebiederm.org>
Date:	Mon, 11 May 2009 14:13:32 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fabio Comolli <fabio.comolli@...il.com>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] devtmpfs patches

Kay Sievers <kay.sievers@...y.org> writes:

> On Mon, May 11, 2009 at 18:40, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>> The goal for kernel compile options is that they do not affect the
>> kernels behavior.  The behavior in devmtmpfs clearly does not match
>> that rule.  The kernel acts very different with it compiled in
>> and with it not compiled in. So that section of the code deserves.
>
> It's the same as with any other option, like the ones that enable
> dynamic minors.

No it's not.

The practical goal is that a distribution can enable essentially every feature
in the kernel and not be forced to use one.

The most similar example I can think of is the dhcp client in the kernel.
Even when compiled in only if you enable it on the command line (aka ip=dhcp)
does it enable and attempt to network boot.

Mouting on /dev might be sane if it was enabled by a kernel command line option.
By default it is wrong.

Dynamic minors is right on that hairy edge.  I'm puzzled know why we
can't have the first N devices use the static assignment and the rest
of the devices use the dynamic minors.

Eric
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