linux-kernel - Re: lguest rebroken in 2.6.22-rc3-mm1

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Message-Id: <200706051201.32137.ak@suse.de>
Date:	Tue, 5 Jun 2007 12:01:31 +0200
From:	Andi Kleen <ak@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: lguest rebroken in 2.6.22-rc3-mm1


> But TSC is a "required feature", so "cpu_has_tsc" is always true.

Hmm? It isn't. What makes you think so?

cpufeature.h:
#define cpu_has_tsc             boot_cpu_has(X86_FEATURE_TSC)

% grep -i tsc include/asm-i386/required-features.h
% 

> How about this patch:
> ===
> Don't try to disable the TSC: it's a required feature under modern
> configurations, so just mark the sched clock unstable which has the
> same effect.

No, using the cpuid bit is the correct way. Or better fix lguest to support
TSC properly. You cannot stay forever in the keep-it-over-simple Minix trap anyways.

-Andi

 
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