discontig-ia64 and acpi-numa patches

Hi!

This is a second attempt to split the discontig-ia64 patch. The result is on sourceforge at:
http://sf.net/project/showfiles.php?group_id=35660&release_id=103977

There are three patches for 2.4.18 + ia64-020722 :

The main change: the previous core part was splitted, the ACPI initialization was changed into arch-dependent and -independent parts.

01_discontig-acpi-numa.diff : required, provides ACPI initialization
of NUMA specific variables.

02_discontig-core.diff : core part providing discontigmem
functionality.

03_discontig-krel-krep.diff : optional part of discontigmem, provides
kernel relocation and replication. Required on SGI SN.

You can pply additionally one of the zonelist patches and the discontig-proc_info patch from the previous release.

The ACPI part of the patch has been radically changed, it fits into the structure (arch-dependend + independent) proposed by Tak Kouchi. This part is functional and useful even without discontigmem. It basically gathers the NUMA related information and puts it into the structures node_memblk, node_cpuid, numa_slit. These contain, respectively, the affinity information of memory blocks, cpus and the locality information of the nodes. The code is quite arch-independent and could be used by other architectures which have ACPI SRAT/SLIT information.

The patches are building blocks for the discontigmem needs on IA64:
NEC Azusa/Asama, DIG64: required: acpi-numa + core,
optional: krel-krep
SGI SN : required: acpi + core + krel-krep

For those involved into the DIG-discontigmem development: I've set CHUNKSIZE and CLUMPSIZE to be equal in mmzone_dig_numa.h. This avoids some pitfalls and we expect anyway contiguous physical memory here, so it doesn't matter.

The patch is tested on 4 node Azusa. I left out the phoney SRAT/SLIT tables, they are now slightly more difficult to parse without extra code, so I'm afraid right now there's no way to test pseudo-NUMA on BigSur or Tiger.

Best regards,
Erich