linux-kernel - Re: rdmsr_safe_on

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Message-ID: <47C50860.2050108@zytor.com>
Date:	Tue, 26 Feb 2008 22:51:12 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dan Upton <upton.dan.linux@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: rdmsr_safe_on_cpu hangs?

Dan Upton wrote:
> 
> I guess the question is, am I just misunderstanding the use of
> rdmsr_safe_on_cpu, or is it an issue with that particular MSR (some of
> the stuff I've read indicates that rdmsr_safe was really only
> implemented as a prequel to the coretemp driver), or is it something
> wrong with rdmsr_safe_on_cpu?
> 

*msr_safe_*() can only trap #GP's, which would be manifest as oopses if 
you used the unsafe versions.  If the CPU *hangs* when touching an MSR, 
nothing we can do in software will help.

	-hpa
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