Re: [tip:x86/mm] x86, mm: Move reserving low memory later in initialization

From: ivory
Date: Fri Mar 21 2014 - 04:38:04 EST

This patch seems to make the bios_corruption_check not to cover the lowest
64kB of memory anymore but only the lowest 4kB. Was this deliberate?
When I use kernel 3.9 or higher I always get low mem corruption message from
the bios corruption checker when I resume from suspend.

Below kernel 3.9 I see this boot message:
e820 update range: 0000000000000000 - 0000000000010000 (usable) ==>
... which is the 64kB.

But on newer kernels the message changed to:
e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
... which is only 4kB.

The corrupted low mem areas I get the message for after resuming from
suspend is this:
Corrupted low memory at c0002d00 (2d00 phys) = 11060000
Corrupted low memory at c0002d04 (2d04 phys) = 80805122
Corrupted low memory at c0002d08 (2d08 phys) = 00860003

How to fix this in kernel 3.9 and higher?

Thanks for your help and best regards.

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