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

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Message-ID: <2375c9f90906072341o2cded749m45bdddfdb499469@mail.gmail.com>
Date:	Mon, 8 Jun 2009 14:41:06 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Tao Ma <tao.ma@...cle.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.

On Mon, Jun 8, 2009 at 2:02 PM, Tao Ma<tao.ma@...cle.com> wrote:
>
>
> 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

Yes?
Your printk() shows kcore size is: 5301604352, and in your subject it is
281474974617600...

Or they happened in the same time?
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