Messages in this thread | | | Date | Thu, 15 Jan 2009 08:53:26 +0000 | From | "Jan Beulich" <> | Subject | Re: [PATCH] x86: simplify HIGHMEM-related Kconfig entries |
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>>> "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
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