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

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Message-ID: <20090608015242.GB2596@cr0.nay.redhat.com>
Date:	Mon, 8 Jun 2009 09:52:42 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Tao Ma <tao.ma@...cle.com>,
	Amerigo Wang <xiyou.wangcong@...il.com>,
	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 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??

Thanks.
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