Message-ID: <486788F4.5060202@firstfloor.org>
Date: Sun, 29 Jun 2008 15:07:00 +0200
From: Andi Kleen <andi@firstfloor.org>
User-Agent: Thunderbird 1.5.0.12 (X11/20060911)
MIME-Version: 1.0
To: Avi Kivity <avi@qumranet.com>
CC: Agner Fog <agner@agner.org>, Arjan van de Ven <arjan@infradead.org>,
       "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: ABI change for device drivers using future AVX instruction set
References: <48626514.2040905@agner.org> <20080625092224.736c2541@infradead.org> <4862ECAB.1040402@zytor.com> <4864CFA5.9050901@agner.org> <20080627072231.7337ba18@infradead.org> <4865F0DA.2050906@agner.org> <87myl5pyqo.fsf@basil.nowhere.org> <4866541F.1060709@agner.org> <20080628200231.GA21259@one.firstfloor.org> <48677313.8000804@qumranet.com> <48677E39.6000001@firstfloor.org> <486780BA.6010202@qumranet.com>
In-Reply-To: <486780BA.6010202@qumranet.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 617
Lines: 20


>>> We could change kernel_fpu_begin() not to disable
>>> preemption, but instead set a task flag.  When we get the "no device"
>>> fault, if the flag is set, save the fpu state into the kernel fpu save
>>> area     
>>
>> What kernel fpu save area do you mean?
>>   
> 
> A new one, of course.
> 

With that we would be eventually in the mess Agner talked about.

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/