On 08/20/2011 05:48 AM, Bjorn Helgaas wrote:

On Tue, Aug 16, 2011 at 9:43 PM, Pavel Ivanov [off-list ref] wrote:

quoted

Ever since I switched from kernel 2.6.38 to 3.0 and later versions I
always get the following error message on each boot:

[    2.844242] APEI: Can not request iomem region
<00000000bf7b522a-00000000bf7b522c> for GARs.

If it was only in dmesg I wouldn't even notice it. But it's always
printed on the console which is kind of annoying.
I don't quite understand what this message is about and couldn't find
anything on the internet. Does this message mean some error that I
could fix? If no, is there any way I can suppress it (besides lowering
the error level of messages printed on console, of course)?

[+cc Huang Ying, APEI author]

BIOS-e820: 00000000bf79e000 - 00000000bf7d0000 (ACPI NVS)
APEI: Can not request iomem region <00000000bf7b522a-00000000bf7b522c> for GARs.

This register is in the ACPI NVS region, which is type E820_NVS (not
E820_RESERVED), so e820_reserve_resources() reserves it as
IORESOURCE_BUSY.  My guess is that Huang tested this on machines where
the EINJ/ERST registers are in "reserved" regions, not ACPI NVS
regions.  The "reserved" regions are not marked IORESOURCE_BUSY.

Huang, when you fix this, please include something like the following
(mangled) patch so the error message is more consistent with other
resource messages.

The patch looks good.  Can you resubmit it with changelog?

Could you also remove the ERST/EINJ/HEST "Table is not found"
messages?  As far as I can tell, these tables are optional, and
printing the message is confusing to users, e.g.,
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/599715

Yes.  This seems confusing to them.  I will change this.

Best Regards,
Huang Ying