linux-kernel - Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev tmpfs

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Message-ID: <20090506184122.721c890d@infradead.org>
Date:	Wed, 6 May 2009 18:41:22 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Jan Blunck <jblunck@...e.de>
Subject: Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev
 tmpfs

On Thu, 30 Apr 2009 15:23:42 +0200
Kay Sievers <kay.sievers@...y.org> wrote:

> From: Kay Sievers <kay.sievers@...y.org>
> Subject: driver-core: devtmpfs - driver core maintained /dev tmpfs
> 
> Devtmpfs lets the kernel create a tmpfs very early at kernel
> initialization, before any driver core device is registered. Every
> device with a major/minor will have a device node created in this
> tmpfs instance. After the rootfs is mounted by the kernel, the
> populated tmpfs is mounted at /dev. In initramfs, it can be moved
> to the manually mounted root filesystem before /sbin/init is
> executed.

so just to state the obvious: this code is not needed to boot fast.
It is mostly a workaround for having a bad initrd; if you don't use an
initrd, or if you use an initrd that's made with the right device nodes
in it already, you really just don't need this.

I would much rather that you just fix your initrd... than to put this
sort of thing into the kernel....



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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