[arch-projects] [udev][RFC][2/5] moving static nodes to udev-compat

[Gerardo Exequiel Pozzi]

On 05/14/2011 07:39 PM, Tom Gundersen wrote:
> On Sun, May 15, 2011 at 12:31 AM, Aaron Griffin<aaronmgriffin at gmail.com>  wrote:
>> I was under the impression that some of these nodes are needed for
>> udev to start working. At least, back in the day, I know that console,
>> null, and zero needed to be created before udev started. If this is no
>> longer true, then I see no issues with making them go away. Unless
>> they're needed in early userspace before udev starts... but mkinitcpio
>> could always create those nodes.
> They used to be needed. However, with devtmpfs they are not. The
> essential ones (for early userspace) exist by default and the rest are
> created when udev is started.
>
> A quick test: delete /lib/udev/devices from your machine and notice
> that everything still works.
>
> A more thorough test: move /lib/udev/devices to /lib/udev/devcise.old
> (say) and reboot with init=/bin/bash (it would be best to do this with
> a self-compiled kernel that can boot without a initramfs to make sure
> nothing touches /dev at all). Now compare the contents of /dev with
> /lib/udev/devices.old.
>
> Cheers,
>
> Tom
>
At least loop0 should exists. Having /dev/loop0 make this command (mount 
pepito.img /mnt/pepito) works without loading before loop module. This 
is because loop.ko is autoloaded when something tries access to a loop 
device.

-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1