From: "H. Peter Anvin" <hpa@zytor.com>
To: Dan Upton <upton.dan.linux@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: rdmsr_safe_on_cpu hangs?
Date: Tue, 26 Feb 2008 22:51:12 -0800 [thread overview]
Message-ID: <47C50860.2050108@zytor.com> (raw)
In-Reply-To: <ba7d8f720802261358h31e30308ob4d99e05a34cf584@mail.gmail.com>
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
prev parent reply other threads:[~2008-02-27 6:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 21:58 rdmsr_safe_on_cpu hangs? Dan Upton
2008-02-27 6:51 ` H. Peter Anvin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47C50860.2050108@zytor.com \
--to=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=upton.dan.linux@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.