Little question about modules...

Little question about modules...

[Nicolas Noble]

Just a question:

Why do I have used by -1 for the module ipv6 onto my system?

extract of the /proc/modules:

ip6table_filter         1988   0 (unused)
ip6t_mark                688   0 (unused)
ip6t_limit              1016   0 (unused)
ip6_tables             13044   3 [ip6table_filter ip6t_mark ip6t_limit]
ipv6                  117992  -1


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Re: Little question about modules...

[David Weinehall]

On Sun, Jan 14, 2001 at 03:20:52AM +0100, Nicolas Noble wrote:
> 
> Just a question:
> 
> Why do I have used by -1 for the module ipv6 onto my system?
> 
> extract of the /proc/modules:
> 
> ip6table_filter         1988   0 (unused)
> ip6t_mark                688   0 (unused)
> ip6t_limit              1016   0 (unused)
> ip6_tables             13044   3 [ip6table_filter ip6t_mark ip6t_limit]
> ipv6                  117992  -1

To make sure ipv6 can't get unloaded. If I remember correctly, the
ipv6 code will oops nicely if unloaded.


/David Weinehall
  _                                                                 _
 // David Weinehall <tao@acc.umu.se> /> Northern lights wander      \\
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Re: Little question about modules...

[Russell King]

Nicolas Noble writes:
> Why do I have used by -1 for the module ipv6 onto my system?

I guess this is going to be a new FAQ!  Can we add it to the lkml FAQ
please?

"-1" means that the module itself decides whether it can be unloaded or
not, in this case it is decided by the function "ipv6_unload".  It is
not a bug to have a use count of "-1".
   _____
  |_____| ------------------------------------------------- ---+---+-
  |   |         Russell King        rmk@arm.linux.org.uk      --- ---
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Re: Little question about modules...

[Keith Owens]

On Sun, 7 Jan 2001 09:58:47 +0000 (GMT), 
Russell King <rmk@arm.linux.org.uk> wrote:
>Nicolas Noble writes:
>> Why do I have used by -1 for the module ipv6 onto my system?
>
>I guess this is going to be a new FAQ!  Can we add it to the lkml FAQ
>please?

>From man insmod in modutils 2.4.1 (not released yet).

  If the module controls its own unloading via a can_unload routine
  then the user count displayed by lsmod is always -1, irrespective of
  the real use count.

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Re: Little question about modules...

[David Ford]

On Sun, 7 Jan 2001, Keith Owens wrote:
>   If the module controls its own unloading via a can_unload routine
>   then the user count displayed by lsmod is always -1, irrespective of
>   the real use count.

Maybe lsmod can show a blank for the field and (auto unload).  That'd
probably draw a lot less "my module is broken" reports.

-d


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