linux-kernel - Re: [PATCH 6/8] Allow per-cpu variables to be page-aligned

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Message-ID: <45EDB057.5080106@goop.org>
Date:	Tue, 06 Mar 2007 10:17:59 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 6/8] Allow per-cpu variables to be page-aligned

Rusty Russell wrote:
> Xen wants page-aligned GDT (and PDA must not cross a page-boundary,
> but that doesn't happen at the moment since it's so close to start of
> page).  Let's allow page-alignment in general for per-cpu data.
>
> Because larger alignments can use more room, we increase the max
> per-cpu memory to 64k rather than 32k: it's getting a little tight.
>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
>
> diff -r 213b1ec27001 arch/alpha/kernel/vmlinux.lds.S
> --- a/arch/alpha/kernel/vmlinux.lds.S	Tue Mar 06 19:01:59 2007 +1100
> +++ b/arch/alpha/kernel/vmlinux.lds.S	Tue Mar 06 19:02:03 2007 +1100
> @@ -69,7 +69,7 @@ SECTIONS
>    . = ALIGN(8);
>    SECURITY_INIT
>  
> -  . = ALIGN(64);
> +  . = ALIGN(8192);
>   

Isn't there a PAGE_SIZE we can use here?  PAGE_SIZE_asm?
(ditto all archs)

    J
-
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