linux-kernel - Re: [Q] x86

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Message-ID: <20080225080644.GA6744@cvg>
Date:	Mon, 25 Feb 2008 11:06:44 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Q] x86 - boot/header.S

[H. Peter Anvin - Sun, Feb 24, 2008 at 06:15:52PM -0800]
> Cyrill Gorcunov wrote:
>> Hi Peter, Sam,
>> could you take a look on x86/boot/header.S:280 please?
>> # Zero the bss
>> 	movw	$__bss_start, %di
>> 	movw	$_end+3, %cx
>> 	xorl	%eax, %eax
>> 	subw	%di, %cx
>> 	shrw	$2, %cx
>> 	rep; stosl
>> I wonder why is $_end there instead of $__bss_stop?
>> Well, accroding to vmlinux_32.lsd both _end and __bss_stop
>> are the same BUT __bss_stop is more convenient methink.
>> Would it be usefull to change?
>
> x86/boot/header.S goes with x86/boot/setup.ld and no other linker script.
>
> 	-hpa
>

indeed... :( anyway, setup.ld has the definition of __bss_stop too
though in this case __bss_stop is not equal to _end BUT
[__bss_start;__bss_stop] do cover *bss section anyway.

According to Sam's last post it will not be a problem anymore
'cause of memset further usage.

Thanks for comments, Peter.

		- Cyrill -
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