2.4.0-test: rmmod -a without effect

2.4.0-test: rmmod -a without effect

[Kurt Garloff]

Hi,

this is a 2.4.0-test11 system;
rmmod -a (modutils-2.3.21) fails to unload unused autocleanable modules:
modprobe -r behaves the same, BTW

root@cantaloupe:~ > lsmod
Module                  Size  Used by
ppp_deflate            44736   0  (autoclean) (unused)
ppp_generic            25728   0  (autoclean) [ppp_deflate]
root@cantaloupe:~ > rmmod -a
root@cantaloupe:~ > lsmod
Module                  Size  Used by
ppp_deflate            44736   0  (autoclean) (unused)
ppp_generic            25728   0  (autoclean) [ppp_deflate]

As the binary does just a syscall delete_module(0), I guess it's the
kernel's fault. Same behaviour with 2.4.0-test9 and -test11-ac2.

Is this known and to be expected?

Regards,
-- 
Kurt Garloff  <garloff@suse.de>                          Eindhoven, NL
GPG key: See mail header, key servers         Linux kernel development
SuSE GmbH, Nuernberg, FRG                               SCSI, Security
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Re: 2.4.0-test: rmmod -a without effect

[Keith Owens]

On Wed, 29 Nov 2000 01:37:22 +0100,
Kurt Garloff <garloff@suse.de> wrote:
>this is a 2.4.0-test11 system;
>rmmod -a (modutils-2.3.21) fails to unload unused autocleanable modules:

Designed behaviour.  sys_delete_module only removes autoclean modules
that have been used at least once, either they have been used or some
other module has a reference to them.  Otherwise you get nasty races
like this

  cpu 0                           cpu 1
  request_module(foo)
    modprobe -k foo
      insmod -k foo
        foo is loaded, unused
  kernel sees foo has loaded
                                  rmmod -a
  kernel uses foo

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