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Message-ID: <46C2F19A.30003@anagramm.de>
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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