linux-kernel - Re: Absolute symbols in vmlinux

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Date:	Mon, 09 Mar 2009 22:32:25 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Absolute symbols in vmlinux_64.lds.S

Jeremy Fitzhardinge wrote:
> 
> Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> Jeremy Fitzhardinge wrote:
>>> Why does vmlinux_64.lds.S use absolute symbols for things like
>>> __bss_start/stop:
>>>
>>>  __bss_start = .;        /* BSS */
>>>  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
>>>     *(.bss.page_aligned)
>>>     *(.bss)
>>>     }
>>>  __bss_stop = .;
>>>
>>>
>>> vmlinux_32.lds.S puts __bss_start/stop into the .bss section itself.  Is
>>> there some particular reason they need to be absolute symbols
>>> (relocation?).
>>>
>> they are the same.
> 
> Do you mean it makes no difference?

Sure. System.map should tell the value after the building.

YH
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