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 <[EMAIL PROTECTED]> wrote: > > >>>>> "david" == david mosberger <[EMAIL PROTECTED]> 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 > - > To unsubscribe from this list: send the line "unsubscribe linux-ia64" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
