linux-kernel - Re: [patch]VMSPLIT

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Message-ID: <Pine.LNX.4.61.0612021952250.25553@yvahk01.tjqt.qr>
Date:	Sat, 2 Dec 2006 19:53:38 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Pavel Machek <pavel@....cz>
cc:	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch]VMSPLIT_2G conflicts with PAE


>> 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.
>
>Do we allow user entering arbitrary value here? In any case, it would
>be nice to document alignment requirements of this one, because
>otherwise someone *will* get it wrong.

There was a reason 0x78000000 was chosen
http://marc.theaimsgroup.com/?l=linux-kernel&m=113690073801820&w=2

Though further back in 
http://marc.theaimsgroup.com/?l=linux-kernel&m=113689790817521&w=2
0x80000000 was indeed posted.


	-`J'
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