Re: modutils 2.4.2, please test asap

[David Brownell <david-b@pacbell.net>]

> From: Keith Owens <kaos@ocs.com.au>
> Sent: Monday, January 22, 2001 3:42 PM
>
> On Mon, 22 Jan 2001 15:21:33 -0800, 
> David Brownell <david-b@pacbell.net> wrote:
> >Ah, but the hotplug utilities use it.
> >
> >A pure 2.2 system (kernel + modutils) has no "modules.*map" files.
> >A pure 2.4 system (ditto) does have them.
> >
> >But 2.2.18 kernel + 2.4 modutils will generate "modules.*map" files,
> >which is not compatible with the previous behavior of 2.2 modutils
> >with such kernels.
> 
> Tricky.  Something has to know whether to use modules.usbmap or not on
> 2.2.  This is one occasion when _not_ creating a file might be the
> correct approach. 

It'd certainly be more convenient for 2.2 based systems.


>     If I change modutils 2.4.2 to unlink existing map
> files and only create a new map file if at least one module contains
> that map, will that fix the 2.2 problem?

Yes.  Though given what you say below, I wonderif a better fix would
be to never create "modules.usbmap" if there are 2.2 style /lib/modules/
directories.  (That is, make the backwards compatibility mode cover
all the features that changed.)


> What, if anything, will break if maps files are not always created?

Likely nothing will break, but the 2.4 systems might get a bit confused
(falling back to usb.distmap)which _might_ cause something to break.
I'll have to think about it.

- Dave


> >I forget (haven't used 2.2 in a long time) -- does 2.4 modutils
> >keep to the 2.2 style module tree on 2.2 kernels, or does it change
> >that around too?
> 
> Modutils 2.4 handles both directory styles under /lib/modules/<version>,
> for backwards compatibility.  It is the kernel Makefile which sets the
> directory style for /lib/modules and there are no plans to backport the
> 2.4 style to 2.2.  AC will not take a 2.2 kernel patch that forces
> users to upgrade their user space utilities.
> 


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