2.6.17-rc1: kernel only boots one CPU on HT system

Hello,

Starting with kernel 2.6.17-rc1 (also happens with 2.6.17-rc2), second 
logical-CPU of my Hyperthreading system no longer boots.

I tracked up changes in APIC code, and it appears reverting commit 
7c5c1e427b5e83807fd05419d1cf6991b9d87247 fixes this bug.

See both dmesgs, and kernel configuration attached.

Feel free to ask me if you need other informations.
Please CC me as I'm not subscribed to LKML.


Hardware : 
------------------------------
MB: Gigabyte GA-8SINXP1394
CPU: Intel Pentium 4 3.06Ghz HT
RAM: Corsair 512Mo

cat /proc/cpuinfo: (patched kernel)
------------------------------
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
stepping        : 7
cpu MHz         : 3081.400
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips        : 6165.74

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
stepping        : 7
cpu MHz         : 3081.400
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips        : 6162.10

cat /proc/interrupts :  (patched kernel)
-----------------------------
           CPU0       CPU1
  0:    2143303       6647    IO-APIC-edge  timer
  1:         15          9    IO-APIC-edge  i8042
  4:          7          1    IO-APIC-edge  serial
  8:      19518          1    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 15:      37053         23    IO-APIC-edge  ide1
 16:     240872          1   IO-APIC-level  cx88[0], eth-lan
 17:      11128         19   IO-APIC-level  ide2, ide3
 18:      63432          4   IO-APIC-level  libata, ohci1394, CS46XX
 19:          0          3   IO-APIC-level  ehci_hcd:usb1
 20:     457635        195   IO-APIC-level  ohci_hcd:usb2
 21:          0          0   IO-APIC-level  ohci_hcd:usb3
 22:          0          0   IO-APIC-level  ohci_hcd:usb4
NMI:    2149889    2149786
LOC:    2150122    2150121
ERR:          0
MIS:          0

-- 
Kevin Baradon
Telecom Student
-

Attachment: config-2.6.17-rc2.gz
Description: GNU Zip compressed data

Attachment: dmesg-2.6.17-rc2-patched.gz
Description: GNU Zip compressed data

Attachment: dmesg-2.6.17-rc2-unpatched.gz
Description: GNU Zip compressed data

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