Re: [hpoj-devel] Re: SMP Problems with hpoj-0.6

[Burkhard K. <bu...@bu...>]

David Paschal wrote:
> > First of all it's not a problem of version 0.6, it's more general, since
> > 0.5 make the same problems. It's really a problem of the SMP kernel:
> > (Seems I've never tested 0.5 with a SMP kernel.)
> > 
> > If I boot a non-SMP kernel and load the modules I build on this kernel,
> > it works (I've at least printed one page with ptal-connect).
> > If I boot the SMP kernel and load the SMP kernel modules it crashes at
> > "hpo devid".
> Hi, Alexander.  I feel a little better knowing that I didn't break it in
> my changes for 0.6.  :-)

Keep in mind that there is a chance that SMP related problems might
be compiler problems. From /usr/src/linux/Documentation/Changes
I know that gcc 2.7.2.3 works fine, egcs 2.91.66 now is 
considered to be o.k (although I have one testcase where a kernel
module compiled with this version does not work properly, whereas
it works with 2.7.2.3 and 2.95.2) and gcc 2.95.x versions might have 
problems.

I know this is nasty, but the compiler can make a difference.

> 
> > If I try to load the modules build with the non-SMP kernel into the
> > running SMP kernel it gives unresolved kernel symbols (and also
> > vice-versa), although the module and kernel source where the same!
> Switching between SMP and non-SMP kernels may change version information
> attached to kernel symbols.  This would cause unresolved kernel symbol
> errors as if you had switched kernel versions.
You can't mix non-SMP modules with a SMP kernel and vice versa.

Burkhard

-- 
Burkhard Kohl			bu...@bu...