Re: ip_contrack module refuses to load...

From: Herbert Poetzl <herbert_at_13thfloor.at>
Date: 2005-09-02 13:37:24
On Tue, Aug 30, 2005 at 03:01:01PM -0700, david mosberger wrote:
> Ah, I understand now what you mean.  Sounds to me like the generic
> module loader infrastructure needs to be changed to support the
> IA64-usage.  On IA64, we want to have per-CPU variables remapped even
> on UP, because it allows for more efficient and TLB-pinned addressing
> (which is relied upon in some low-level code for correctness, IIRC).

doesn't that mean that those variables are a
special kind of (per-CPU) variables and should
get a special handling anyway?

if not, then I'd agree with Peter that a per-cpu 
variable on UP should not be treated any different 
from a normal variable ...

maybe you could clarify

TIA,
Herbert

>   --david
> 
> On 8/30/05, Peter Chubb <peterc@gelato.unsw.edu.au> wrote:
> > >>>>> "david" == david mosberger <dmosberger@gmail.com> writes:
> > 
> > david> The module-loader does its own UP special-casing.  For
> > david> example, percpu_modcopy() is a dummy routine in the UP case,
> > david> apparently because there is not supposed to be any per-CPU
> > david> module data for the UP case.
> > 
> > Precisely.  All the other architectures redefine the DECLARE_PER_CPU()
> > etc., to declare plain variables (i.e., not in a special section) for
> > UP.  So the module loader doesn't have to do anything special for UP,
> > because for UP a per-cpu variable is just the same as a normal
> > variable.
> > 
> > This doesn't work for IA64, which maps per_cpu variables into a
> > separate segment for both UP and SMP.
> > 
> > --
> > Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
> > The technical we do immediately,  the political takes *forever*
> > 
> 
> 
> -- 
> Mosberger Consulting LLC, voice/fax: 510-744-9372,
> http://www.mosberger-consulting.com/
> 35706 Runckel Lane, Fremont, CA 94536
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Received on Fri Sep 02 13:38:08 2005

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