[OpenAFS] tasklist_lock undefined Linux 2.6.18, OpenAFS 1.4.2

Jeffrey Hutzelman jhutz@cmu.edu
Fri, 27 Oct 2006 14:19:21 -0400

On Friday, October 27, 2006 08:02:07 PM +0200 Stefaan 
<stefaan.deroeck@gmail.com> wrote:

> On 10/24/06, Peter N. Schweitzer <pschweitzer@usgs.gov> wrote:
>> Yes, I didn't mean to be unclear.  The problem I'm having is with a
>> 2.6.18 system building 1.4.2.
> I can confirm this.  amd64 box, linux vanilla 2.6.18, openafs 1.4.2,
> both from their original sources
> It does build perfectly, but afterwards
> bubbles ~ # depmod -e -a -F /usr/src/linux-2.6.18/System.map 2.6.18
> WARNING: /lib/modules/2.6.18/fs/openafs/libafs.ko needs unknown symbol
> tasklist_lock
> it seems that the module has an unresolved symbol.
> I have the impression that the developers believe this is fixed. Can
> there be something both Peter and I are doing wrong such that the fix
> is ineffective? Or is something else missing?

Well, the patch I sent to the list should have made the problem go away for 
the original poster, but was incomplete and never meant to be applied in 
that form.  The gatekeepers cleaned it up before committing, but there is 
one case that was missed, which only affects amd64.

What I'm about to suggest isn't the "right" fix; in particular, it will 
probably break syscall table scanning on older kernel versions.  But it 
should make your module load and work.

Go into src/afs/LINUX/osi_probe.c, and look for a line like this:

    (unsigned long)(&tasklist_lock) - 0x30000,

Remove the "- 0x30000" and the unresolved symbol reference should go away.

-- Jeff