linux-kernel - Re: [patch 2/2] x86: lds - Use THREAD

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Message-ID: <20080217201554.GG31968@cvg>
Date:	Sun, 17 Feb 2008 23:15:54 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Sam Ravnborg <sam@...nborg.org>, ak@...e.de, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] x86: lds - Use THREAD_SIZE instead of numeric
	constant

[H. Peter Anvin - Sun, Feb 17, 2008 at 12:11:45PM -0800]
> Cyrill Gorcunov wrote:
>> Thanks Peter for comments. Peter could you clarify for me a bit
>> more on the string:
>> x86/kernel/head_32.S:339
>> 	/* Set up the stack pointer */
>> 	lss stack_start,%esp
>> but stack_start is defined as head_32.S:647
>> .data
>> ENTRY(stack_start)
>> 	.long init_thread_union+THREAD_SIZE
>> so stack_start *must* be aligned with THREAD_SIZE in vmlinux.lds
>> at compiling time. There is no PDA at this booting time. Am I wrong?
>> If you're too busy - just reply me like "Read the code" ;)
>
> That doesn't follow.
>
> You're saying that it *must* be aligned, I don't think that's true anymore; 
> I think nowadays it's more accurate to say that it *is* aligned, but I 
> don't think that's fundamental.
>
> 	-hpa
>

Thanks a lot, Peter.

		- Cyrill -
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