linux-kernel - Re: [PATCH] [3/4] x86_64: Change PMDS invocation to single macro

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Date:	Wed, 15 Aug 2007 14:29:14 +0200
From:	Clemens Koller <clemens.koller@...gramm.de>
To:	Andi Kleen <ak@...e.de>
CC:	patches@...-64.org, linux-kernel@...r.kernel.org, torvalds@...l.org
Subject: Re: [PATCH] [3/4] x86_64: Change PMDS invocation to single macro

Andi Kleen schrieb:
> Very old binutils (2.12.90...) seem to have trouble with newlines
> in assembler macro invocation. They put them into the resulting
> argument expansion. In this case this lead to a parse error because
> a .rept expression ended up spread over multiple lines. Change the PMDS() 
> invocation to a single line.
> 
> Signed-off-by: Andi Kleen <ak@...e.de>
> 
> Index: linux/arch/x86_64/kernel/head.S
> ===================================================================
> --- linux.orig/arch/x86_64/kernel/head.S
> +++ linux/arch/x86_64/kernel/head.S
> @@ -345,8 +345,7 @@ NEXT_PAGE(level2_kernel_pgt)
>  	/* 40MB kernel mapping. The kernel code cannot be bigger than that.
>  	   When you change this change KERNEL_TEXT_SIZE in page.h too. */
>  	/* (2^48-(2*1024*1024*1024)-((2^39)*511)-((2^30)*510)) = 0 */
> -	PMDS(0x0000000000000000, __PAGE_KERNEL_LARGE_EXEC|_PAGE_GLOBAL,
> -		KERNEL_TEXT_SIZE/PMD_SIZE)
> +	PMDS(0x0000000000000000, __PAGE_KERNEL_LARGE_EXEC|_PAGE_GLOBAL, KERNEL_TEXT_SIZE/PMD_SIZE)

Can you please add a comment, that this line must stay in a single line
for the above reason? I would expect that the next who does some code
clean up will break it again.

>  	/* Module mapping starts here */
>  	.fill	(PTRS_PER_PMD - (KERNEL_TEXT_SIZE/PMD_SIZE)),8,0

Regards,
-- 
Clemens Koller
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