Re: add devname module aliases to allow module on-demand auto-loading

From: Kay Sievers
Date: Fri May 21 2010 - 09:12:05 EST

On Fri, May 21, 2010 at 13:51, Kay Sievers <kay.sievers@xxxxxxxx> wrote:
> On Fri, May 21, 2010 at 13:34, Alasdair G Kergon <agk@xxxxxxxxxx> wrote:

> There is no harm to make a well-know device node static, it just
> solves a lot of problems, and also makes it possible to work off of a
> static /dev.

To illustrate:

On my box without this patch:
dmsetup version
Library version: 1.02.42 (2010-01-14)
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.

And the same box just with this patch, nothing else changed:
dmsetup version
Library version: 1.02.42 (2010-01-14)
Driver version: 4.17.0

But its up to you to care if device-mapper just works, or if there is
stuff like an init script with modprobe needed to load stuff that
might never be needed. :)

This is surely not about dynamic vs. static, it is about race-free
on-demand activation of services and subsystems.

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