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Yinghai Lu 295594e9cf x86: Fix vSMP boot crash 
2.6.31-rc7 does not boot on vSMP systems:

[    8.501108] CPU31: Thermal monitoring enabled (TM1)
[    8.501127] CPU 31 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
[    8.650254] CPU31: Intel(R) Xeon(R) CPU           E5540  @ 2.53GHz stepping 04
[    8.710324] Brought up 32 CPUs
[    8.713916] Total of 32 processors activated (162314.96 BogoMIPS).
[    8.721489] ERROR: parent span is not a superset of domain->span
[    8.727686] ERROR: domain->groups does not contain CPU0
[    8.733091] ERROR: groups don't span domain->span
[    8.737975] ERROR: domain->cpu_power not set
[    8.742416]

Ravikiran Thirumalai bisected it to:

| commit 2759c3287d
| x86: don't call read_apic_id if !cpu_has_apic

The problem is that on vSMP systems the CPUID derived
initial-APICIDs are overlapping - so we need to fall
back on hard_smp_processor_id() which reads the local
APIC.

Both come from the hardware (influenced by firmware
though) so it's a tough call which one to trust.

Doing the quirk expresses the vSMP property properly
and also does not affect other systems, so we go for
this solution instead of a revert.

Reported-and-Tested-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shai Fultheim <shai@scalex86.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <4A944D3C.5030100@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-26 10:13:17 +02:00
..
boot x86: add vmlinux.lds to targets in arch/x86/boot/compressed/Makefile 2009-08-20 16:08:58 -07:00
configs
crypto crypto: aes-ni - Remove CRYPTO_TFM_REQ_MAY_SLEEP from fpu template 2009-06-18 19:44:01 +08:00
ia32
include/asm x86, pat: Allow ISA memory range uncacheable mapping requests 2009-08-17 14:12:44 -07:00
kernel x86: Fix vSMP boot crash 2009-08-26 10:13:17 +02:00
kvm KVM: MMU: limit rmap chain length 2009-08-06 12:06:54 +03:00
lguest lguest: update commentry 2009-07-30 16:03:46 +09:30
lib x86, msr: execute on the correct CPU subset 2009-08-03 14:48:13 -07:00
math-emu
mm Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-08-25 11:23:25 -07:00
oprofile x86/oprofile: rename kernel parameter for architectural perfmon to arch_perfmon 2009-07-10 05:22:50 +02:00
pci x86/pci: insert ioapic resource before assigning unassigned resources 2009-07-10 13:03:14 -07:00
power x86: Fix resume from suspend when CONFIG_CC_STACKPROTECTOR 2009-07-08 13:20:13 +02:00
vdso gcov: enable GCOV_PROFILE_ALL for x86_64 2009-06-18 13:03:58 -07:00
video
xen x86, xen: Initialize cx to suppress warning 2009-08-25 21:10:32 -07:00
Kbuild
Kconfig perf_counter, x86: Fix/improve apic fallback 2009-08-12 14:12:49 +02:00
Kconfig.cpu
Kconfig.debug
Makefile
Makefile_32.cpu