linux-kernel - Re: [2.6.27] overlapping early reservations [was: early exception

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Date:	Mon, 8 Sep 2008 22:00:05 +0200
From:	"Luca Tettamanti" <kronos.it@...il.com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...nel.org>,
	"Peter Zijlstra" <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [2.6.27] overlapping early reservations [was: early exception - lockdep related?]

On Mon, Sep 8, 2008 at 9:35 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Mon, Sep 8, 2008 at 12:14 PM, Luca Tettamanti <kronos.it@...il.com> wrote:
>> On Mon, Sep 8, 2008 at 8:04 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>>> On Mon, Sep 8, 2008 at 10:54 AM, Luca Tettamanti <kronos.it@...il.com> wrote:
>>>
>>> can you post boot log with working kernel + "debug"?
>>
>> This is the map of the early reservations (will send the dmesg + debug later):
>>
>> [    0.000000] (6 early reservations) ==> bootmem [0000000000 - 00bbf90000]
>> [    0.000000]   #0 [0000000000 - 0000001000]   BIOS data page ==>
>> [0000000000 - 0000001000]
>> [    0.000000]   #1 [0000006000 - 0000008000]       TRAMPOLINE ==>
>> [0000006000 - 0000008000]
>> [    0.000000]   #2 [0000200000 - 0000d012b8]    TEXT DATA BSS ==>
>> [0000200000 - 0000d012b8]
>> [    0.000000]   #3 [00037dc000 - 00040fe2d9]          RAMDISK ==>
>> [00037dc000 - 00040fe2d9]
>> [    0.000000]   #4 [000009c800 - 0000100000]    BIOS reserved ==>
>> [000009c800 - 0000100000]
>> [    0.000000]   #5 [0000008000 - 000000b000]          PGTABLE ==>
>> [0000008000 - 000000b000]
>>
>> As a side note: I've bigger older (2.6.26) kernels that boots fine,
>> and smaller 2.6.27 kernels that do not work, e.g. this one:
>
> that could explain sth. big kernel use more,  and lilo put ramdisk
> high from 0x37dc000
>
>>
>> Overlapping early reservations b71000-effb43 RAMDISK to 200000-c84ecf
>> TEXT DATA BSS
>
> need to figure out, lilo put ramdisk so low...
>
> need to know e820 table layout...

 BIOS-provided physical RAM map:
  BIOS-e820: 0000000000000000 - 000000000009c800 (usable)
  BIOS-e820: 000000000009c800 - 00000000000a0000 (reserved)
  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
  BIOS-e820: 0000000000100000 - 00000000bbf90000 (usable)
  BIOS-e820: 00000000bbf90000 - 00000000bbf9e000 (ACPI data)
  BIOS-e820: 00000000bbf9e000 - 00000000bbfe0000 (ACPI NVS)
  BIOS-e820: 00000000bbfe0000 - 00000000bc000000 (reserved)
  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
  BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
 last_pfn = 0xbbf90 max_arch_pfn = 0x3ffffffff

dmesg is attached, but I haven't rebooted yet.

Luca

View attachment "dmesg.txt" of type "text/plain" (57013 bytes)