linux-kernel - Re: [PATCH] x86: simplify HIGHMEM-related Kconfig entries

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Message-ID: <496E3F7D.2060908@zytor.com>
Date:	Wed, 14 Jan 2009 11:39:41 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: simplify HIGHMEM-related Kconfig entries

Jan Beulich wrote:
> Additionally remove the dependency of X86_PAE on !HIGHMEM4G - at least
> I can't understand why that dependency existed.

At least originally, the meaning of the x86 highmem entries were:

	No highmem	- No highmem, no PAE
	HIGHMEM4G	- Highmem, no PAE
	HIGHMEM64G	- Highmem, PAE

So X86_PAE and HIGHMEM4G is a bit of a contradiction.  I haven't looked 
at the logic in detail, or remember offhand if there have been any 
weakening of the definitions above; e.g. someone could have implemented 
a way to do PAE without highmem, to get access to the NX bits.

	-hpa
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