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

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Message-ID: <AANLkTinQwEqFKAiyAwVPwmzLtUXJkaOdZ0c88O_tfp-1@mail.gmail.com>
Date:	Fri, 21 May 2010 15:11:38 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Alasdair G Kergon <agk@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"David S. Miller" <davem@...emloft.net>,
	Miklos Szeredi <miklos@...redi.hu>,
	Chris Mason <chris.mason@...cle.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Ian Kent <raven@...maw.net>
Subject: Re: add devname module aliases to allow module on-demand auto-loading

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

Thanks,
Kay
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