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authorYinghai Lu <yinghai@kernel.org>2009-08-25 16:44:44 -0400
committerIngo Molnar <mingo@elte.hu>2009-08-26 04:13:17 -0400
commit295594e9cf6ae2efd73371777aa8feba0f87f42f (patch)
tree7ff6c01ec12b43ab70504a94cae6b1463d28a68a /arch/um/drivers
parent7adb4df410966dfe43e4815256e3215110648fb8 (diff)
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 2759c3287de27266e06f1f4e82cbd2d65f6a044c | 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>
Diffstat (limited to 'arch/um/drivers')
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