http://bugzilla.kernel.org/show_bug.cgi?id=5930
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
------- Additional Comments From [EMAIL PROTECTED] 2006-01-24 15:43 -------
Diego,
Thanks for the prompt and quick check of all the debug patches. I have narrowed
down on the problem here.
As per my theory, backing out this patch
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fbe83e209ad9c8281e29ac17a60f91119d86fa8c
should also make your system work as before.
Now that I have understood the problem, I will work with Shaohua and Ashok and
get to a clean solution.
Description of the problem.
- This particular BIOS (both Ronald and Diego) is unique in that, it has the
disabled ACPI madt entries mapping to one of the enabled madt entry. Though
strictly it is not out of ACPI spec, it is uncommon though. Typically BIOSes
give some lapic_id like 0x80, 0x81, etc to these disabled CPUs.
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
Processor #0 6:8 APIC version 17
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
Processor #1 6:8 APIC version 17
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x00] disabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x00] disabled)
- With the above change from Ashok, we now look at disabled CPUs as well and
store there lapic_id. As this id is same as one of the enabled CPUs, the ACPI
gets confused while adding CPUs and that results in an error at later point.
- Though this issue was exposed by 5452, that is not the real cause for the
problem.
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