Bug 135272 (IT_51118) - "MP table in the EBDA can be UNSAFE" message on x365
Summary: "MP table in the EBDA can be UNSAFE" message on x365
Status: CLOSED NOTABUG
Alias: IT_51118
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel
Version: 2.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Jason Baron
QA Contact: Brian Brock
URL:
Whiteboard:
Keywords:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2004-10-11 15:59 UTC by Bastien Nocera
Modified: 2013-03-06 05:57 UTC (History)
3 users (show)

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Clone Of:
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Last Closed: 2004-10-28 15:51:22 UTC

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Description Bastien Nocera 2004-10-11 15:59:13 UTC 
Description of problem:
In dmesg after booting an IBM x365 with the 2.4.9-e.49summit kernel:
"kernel: WARNING: MP table in the EBDA can be UNSAFE, contact
linux-smp@vger.kernel.org if you experience SMP problems!"

booting an earlier kernel (2.4.9-e.40summit), there's only this message:
WARNING: unexpected IO-APIC, please mail  to linux-smp@vger.kernel.org 

I believe the problem (MP table warning, as opposed to unknown
IO_APIC) could be due to this changelog entry:
* Sun Jun 20 2004 Jason Baron <jbaron@redhat.com>
                                                                     
                     - elminate unexpected ioapic messages (Jim Paradis)

The BIOS is dated from 08/18/2004 (1.08) and is the current latest for
this machine.
Comment 1 Bastien Nocera 2004-10-11 16:05:38 UTC 
Let us know which pieces of information are required to solve this.
Comment 2 Bastien Nocera 2004-10-28 15:51:22 UTC 
Warning is harmless, and, apparently, only happens with lilo.
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