Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support

[Yinghai Lu]

1. wonder if x2apic can be use with uniprocessor.

in APIC_init_uniprocessor, it will try to enable x2apic, but later

apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));

but SET_APIC_ID is still for xapic version. so need to GET_APIC_ID,
SET_APIC_ID for different
genapic like 32bit.

2 check_x2apic is called in setup_arch, but it only set apic_ops,
and genapic still not changed, aka apic_flat...
wonder if you need to call setup_apic_routing to set genapic.

otherwise read_apic_id could have use the one from apic_flat....need
to shift......

3.or move read_apic_id to apic_ops intead...together with GET_APIC_ID too.
but 32bit version seems like to put GET_APIC_ID with genapic...

which one is better? 2 or 3

YH
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