Re: Bisected 3.9 regression: Corrupted low memory (x86, mm: Move reserving low memory later in initialization)

[H. Peter Anvin]

On 05/21/2014 06:31 AM, RafaÅ MiÅecki wrote:
> On 16 May 2014 07:29, RafaÅ MiÅecki <zajec5@xxxxxxxxx> wrote:
>> Sorry for the late report, this bug appears on my old notebook I don't
>> commonly use. Anyway, I've noticed following problem when using
>> 3.15-rc1:
>>
>> Corrupted low memory at ffff88000000be98 (be98 phys) = b02a000400000000
> 
> Ping?
> 

It's not a regression, but rather a progression: the checker now does
what it claims to do, which is to check for low memory corruption.

However, the checker is also rather useless as anything other than a
diagnostic tool.  It tells you that your BIOS is corrupting memory, and
the solution to that is to reserve the memory, which we already do.

All the checker tells us is that on your system, yes, we really do need
to reserve the memory.

	-hpa

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