linux-kernel - Re: [patch]VMSPLIT

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Message-ID: <20061201075520.GD5400@kernel.dk>
Date:	Fri, 1 Dec 2006 08:55:20 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>
Subject: Re: [patch]VMSPLIT_2G conflicts with PAE

On Fri, Dec 01 2006, Shaohua Li wrote:
> PAGE_OFFSET is 0x78000000 with VMSPLIT_2G, this address is in the middle
> of the second pgd entry with pae enabled. This breaks assumptions
> (address is aligned to pgd entry's address) in a lot of places like
> pagetable_init. Fixing the assumptions is hard (eg, low mapping). SO I
> just changed the address to 0x80000000.
> 
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> 
> diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
> index 8ff1c6f..fddfb26 100644
> --- a/arch/i386/Kconfig
> +++ b/arch/i386/Kconfig
> @@ -532,7 +532,7 @@ endchoice
>  config PAGE_OFFSET
>  	hex
>  	default 0xB0000000 if VMSPLIT_3G_OPT
> -	default 0x78000000 if VMSPLIT_2G
> +	default 0x80000000 if VMSPLIT_2G
>  	default 0x40000000 if VMSPLIT_1G
>  	default 0xC0000000

0x78000000 was chosen since it gives you the full 2G as low memory, if
you mave it 0x80000000 then you still have a little highmem and need
that turned on.

-- 
Jens Axboe

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