linux-kernel - Re: /proc/kcore has a unreasonable size(281474974617600) in x86

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Message-ID: <4A2CA96D.3090502@oracle.com>
Date:	Mon, 08 Jun 2009 14:02:21 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Amerigo Wang <xiyou.wangcong@...il.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64
 2.6.30-rc8.



Amerigo Wang wrote:
> On Sat, Jun 06, 2009 at 03:21:23PM -0700, Yinghai Lu wrote:
>> Tao Ma wrote:
>>> Yinghai Lu wrote:
>>>> Tao Ma wrote:
>>>>> Amerigo Wang wrote:
>>>>>> On Fri, Jun 05, 2009 at 05:30:49PM +0800, Tao Ma wrote:
>>>>>>>> Please send the boot logs: dmesg -s 1000000 > foo
>>>>>>> attached.
>>>>>>> #######high memory 18446612137615818752, size_t 18446612137615818752
>>>>>>> #######kcore size 5301604352, PAGE_OFFSET 0, PAGE_SIZE 4096
>>>>>> These two lines must be added by yourself...
>>>>>>
>>>>>> What?!
>>>>>> How can PAGE_OFFSET be 0??
>>>>>> Can you show us these two printk() you just added?
>>>>>>
>>>>>> And, the size of kcore is not the crazy number in the subject...
>>>>>> This one is much saner..
>>>>> Sorry, I used the wrong printk. the correct one is:
>>>>> #######high memory 18446612137615818752, size_t 18446612137615818752
>>>>> #######kcore size 5301604352, PAGE_OFFSET 18446612132314218496,
>>>>> PAGE_SIZE 4096
>>>>>
>>>> %lx should be used.
>>>>
>>>> also you compiler doesn't like
>>>>
>>>> high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
>>>>
>>>> in setup.c?
>>> Sorry fo my poor English, bug what do you mean?
>>>
>>> I just printk in the setup.c and the result is
>>>
>>> @@@@high_momory ffff88013c000000
>> so that value print out is right.
> 
> Yeah.
> 
> Tao, can you reproduce the number mentioned in the subject??
Sorry for the delay.

But the result is the same and I don't think it should be changed by my 
printk.

Regards,
Tao
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