Re: [PATCH] Cleanup f00f bug code

Mikael Pettersson (
Fri, 28 Sep 2001 01:13:50 +0200 (MET DST)

On Wed, 26 Sep 2001 21:52:09 -0400, Brian Gerst wrote:

>This patch changes the f00f bug workaround code to use a fixed mapping
>instead of touching the page tables directly. It also removes the
>assumption that only 686's don't have the bug. It has been tested for
>normal operation of the relocated IDT, but I don't have a processor with
>the bug to do a real test. Could someone with such a processor please
>verify that the workaround still works?

It doesn't. 2.4.9-ac16 + your patch booted ok on my P5MMX, and the
kernel printed that it applied the F0 0F workaround, but executing
F0 0F C7 C8 in user-space caused an instant lockup.

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