[patch 0/8] Updated patches for x86_64

Hi Andrew,

This patch series contains some misc fixes related to CPU hotplug for X86_64.

Some are new, some are due to regressions from introduction of physflat mode
genapic schemes. Please consider for -mm. These are on 2.6.13-rc4-mm1

do_clustered_apic_check
	Needed for x86_64, removed recently from shared code.
create-sysfs-onlyfor-present-cpus
	Create sysfs entries only for present cpus. New cpus will have them
	created by ACPI code when notification for the same is processed.
fix-enforce-max-cpu
	Dont enforce this when CPU hotplug is enabled. This doesnt permit
	booting with maxcpus=1 and then testing logical hot-add of cpu.
fix-cluster-allbutself-ipi
	Cluster mode also needs to prevent preempt when excluding self from
	online map. Propagating the fix i added for genapic_flat to cluster
	genapic code as well.
fix-flat-mode-nobroadcast-again
	Recent physflat broke this for hotplug. Re-introducing it again.
fix-physflat-dmode
	Removed un-necessary code from physflat settings.
use-common-physflat-cluster
	Used common code for genapic-physflat and cluster since they share 
	a lot of code was duplicated instead of sharing them.
choose-physflat-onlyfor-gt8cpus-amd
	Choose physflat only when >8 cpus. We could still use flat mode without 
	broadcast shortcut. The mask version of IPI is still effective and 
	more performant than the unicast version thats required when we use
	physical mode.

Cheers,
ashok

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• Follow-Ups:
  • [patch 6/8] x86_64:Dont use Lowest Priority when using physical mode.
    • From: Ashok Raj <[email protected]>
  • [patch 8/8] x86_64: Choose physflat for AMD systems only when >8 CPUS.
    • From: Ashok Raj <[email protected]>
  • [patch 2/8] x86_64: create sysfs entries for cpu only for present cpus
    • From: Ashok Raj <[email protected]>
  • [patch 7/8] x86_64:Use common functions in cluster and physflat mode
    • From: Ashok Raj <[email protected]>
  • [patch 1/8] x86_64: Reintroduce clustered_apic_check() for x86_64.
    • From: Ashok Raj <[email protected]>
  • [patch 3/8] x86_64:Dont call enforce_max_cpus when hotplug is enabled
    • From: Ashok Raj <[email protected]>
  • [patch 5/8] x86_64:Dont do broadcast IPIs when hotplug is enabled in flat mode.
    • From: Ashok Raj <[email protected]>
  • [patch 4/8] x86_64:Fix cluster mode send_IPI_allbutself to use get_cpu()/put_cpu()
    • From: Ashok Raj <[email protected]>

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