From: Avi Kivity <avi@argo.co.il>
To: Andi Kleen <ak@suse.de>
Cc: Jiri Slaby <jirislaby@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: FP in kernelspace
Date: Sun, 30 Jul 2006 21:11:07 +0300 [thread overview]
Message-ID: <44CCF63B.6070906@argo.co.il> (raw)
In-Reply-To: <p73u04z2dzu.fsf@verdi.suse.de>
Andi Kleen wrote:
>
> Avi Kivity <avi@argo.co.il> writes:
> >
> > It's also broken for x86-64, which uses sse for floating point, not
> > the x87 fpu.
>
> Sorry, that doesn't make sense.
>
> > kernel_fpu_begin();
> > c = d * 3.14;
> > kernel_fpu_end();
Cannot work on x86-64, even disregarding fp exceptions, because
kernel_fpu_begin() doesn't save the sse state which is used by fp math.
No?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2006-07-30 18:11 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-30 11:28 FP in kernelspace Jiri Slaby
2006-07-30 11:31 ` Jiri Slaby
2006-07-30 14:32 ` Arjan van de Ven
2006-07-30 14:40 ` Avi Kivity
2006-07-30 14:54 ` Arjan van de Ven
2006-07-30 15:09 ` Jiri Slaby
2006-07-30 15:20 ` Arjan van de Ven
2006-07-30 15:23 ` Avi Kivity
2006-07-30 15:21 ` Avi Kivity
2006-07-30 17:34 ` Andi Kleen
2006-07-30 18:11 ` Avi Kivity [this message]
2006-07-30 18:15 ` Andi Kleen
2006-07-30 18:30 ` Avi Kivity
2006-07-30 18:17 ` Jan Engelhardt
2006-07-30 17:33 ` Andi Kleen
2006-07-30 18:18 ` Jan Engelhardt
2006-07-30 18:28 ` Avi Kivity
2006-07-30 23:11 ` Jan Engelhardt
2006-07-30 17:32 ` Andi Kleen
2006-07-31 0:33 ` Steven Rostedt
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=44CCF63B.6070906@argo.co.il \
--to=avi@argo.co.il \
--cc=ak@suse.de \
--cc=jirislaby@gmail.com \
--cc=linux-kernel@vger.kernel.org \
/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.