From: Jens Axboe <jens.axboe@oracle.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: lkml <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@osdl.org>
Subject: Re: [patch]VMSPLIT_2G conflicts with PAE
Date: Fri, 1 Dec 2006 08:55:20 +0100 [thread overview]
Message-ID: <20061201075520.GD5400@kernel.dk> (raw)
In-Reply-To: <1164944925.1918.5.camel@sli10-conroe.sh.intel.com>
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@intel.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
next prev parent reply other threads:[~2006-12-01 7:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-01 3:48 [patch]VMSPLIT_2G conflicts with PAE Shaohua Li
2006-12-01 7:55 ` Jens Axboe [this message]
2006-12-01 8:34 ` Shaohua Li
2006-12-02 13:05 ` Pavel Machek
2006-12-02 18:53 ` Jan Engelhardt
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