Booting an x86-64 2.6.37 kernel under QEMU with the attached .config and
this  qemu command line:

  qemu-system-x86_64 -nographic -no-reboot -kernel "zImage-x86_64" \
    -hda "image-x86_64.sqf" -append \
    "root=/dev/hda rw init=/sbin/init.sh panic=1 PATH=/bin:/sbin console=ttyS0 HOST=x86_64"

It said this during boot:

CPU: AMD QEMU Virtual CPU version 0.13.50 stepping 03
Setting APIC routing to flat
------------[ cut here ]------------
WARNING: at arch/x86/kernel/apic/apic.c:1287 setup_local_APIC+0x18f/0x263()
Hardware name: Bochs
Pid: 1, comm: swapper Not tainted 2.6.37 #1
Call Trace:
 [<ffffffff812dc36d>] ? setup_local_APIC+0x18f/0x263
 [<ffffffff8101c86b>] ? warn_slowpath_common+0x73/0x88
 [<ffffffff812dc36d>] ? setup_local_APIC+0x18f/0x263
 [<ffffffff812c6155>] ? APIC_init_uniprocessor+0x99/0x109
 [<ffffffff812bf886>] ? kernel_init+0x5e/0x122
 [<ffffffff81002694>] ? kernel_thread_helper+0x4/0x10
 [<ffffffff812bf828>] ? kernel_init+0x0/0x122
 [<ffffffff81002690>] ? kernel_thread_helper+0x0/0x10
---[ end trace 4eaa2a86a8e2da22 ]---
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
devtmpfs: initialized

And so on.  Seems to have booted fine, but I thought you'd like to know
and I couldn't find a mention of this in the January lkml archive...

Rob