linux-kernel - Re: [git pull] x86 fixes

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Message-ID: <48C587A1.5010206@zytor.com>
Date:	Mon, 08 Sep 2008 13:14:25 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] x86 fixes

Arjan van de Ven wrote:
> 
> I'd lump all cpus that don't have cpuid in this bucket too (eg half the
> 486es) simply because not having cpuid is painful in pretty much the
> same way.
> 

Not really.  Detecting CPUID is pretty trivial, and we just initialize 
the feature vector to zero if it isn't there.

>>  - "modern 32-bit": PPro and better. Can take CMOV, MMX and TSC for 
>>    granted.
> 
> again makes sense; question is if it makes sense to take PSE and PAE
> for granted as well (although PSE we can do runtime I suppose)

Well, PAE implies PSE.  Unfortunately Intel released a series of 
Pentium-Ms without PAE support.  We *should* be able to take PSE for 
granted, but there is Xen damage.

	-hpa
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