From: "Jan Beulich" <jbeulich@novell.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: <mingo@elte.hu>, <tglx@linutronix.de>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: simplify HIGHMEM-related Kconfig entries
Date: Thu, 15 Jan 2009 08:53:26 +0000 [thread overview]
Message-ID: <496F0796.76E4.0078.0@novell.com> (raw)
In-Reply-To: <496E3F7D.2060908@zytor.com>
>>> "H. Peter Anvin" <hpa@zytor.com> 14.01.09 20:39 >>>
>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.
Exactly - .23 made PAE an independently selectable option (in particular,
the no-highmem+PAE combination is now valid), but I can't see why it
added the !HIGHMEM4G dependency.
Jan
next prev parent reply other threads:[~2009-01-15 8:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-14 12:31 [PATCH] x86: simplify HIGHMEM-related Kconfig entries Jan Beulich
2009-01-14 19:39 ` H. Peter Anvin
2009-01-15 8:53 ` Jan Beulich [this message]
2009-01-15 8:57 ` Ingo Molnar
2009-01-15 17:10 ` H. Peter Anvin
2009-01-16 11:57 ` Jan Beulich
2009-01-16 18:22 ` H. Peter Anvin
2009-01-16 21:18 ` Ingo Molnar
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