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Subject: Re: missing mxcsr initialization
To: torvalds@transmeta.com (Linus Torvalds)
Date: Fri, 27 Oct 2000 12:42:03 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), andrea@suse.de (Andrea Arcangeli),
        dledford@redhat.com (Doug Ledford), paubert@iram.es (Gabriel Paubert),
        mingo@redhat.com, gareth@valinux.com, linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.10.10010262229330.864-100000@penguin.transmeta.com> from "Linus Torvalds" at Oct 26, 2000 10:35:25 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Go back. Read ym email. Realize that you do this ONCE. At setup time.

(I've got about 2000 to read after this jaunt so I may have missed some)

> You can even split SEP into SEPOLD and SEPNEW, and _always_ just test one
> bit. You should not have to test stepping levels in normal use: that
> invariably causes problems when there are more than one CPU that has some
> feature.

Agree

> 	if (vendor == intel && stepping < 5) {
> 		...
> 	}
> 
> and it appears to work again, until it turns out that Cyrix has the same
> issue, and then it ends up being the test from hell, where different
> vendor tests all clash, and it gets increasingly difficult to add a new
> thing later on sanely. 

And you end up with mtrr.c

> No thank you. We'll just require fixed feature flags. Which can be turned
> on as the features are enabled.

That seems sensible

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