linux-kernel - Re: ABI change for device drivers using future AVX instruction set

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Message-ID: <48678E48.8010809@qumranet.com>
Date:	Sun, 29 Jun 2008 16:29:44 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Agner Fog <agner@...er.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: ABI change for device drivers using future AVX instruction set

Andi Kleen wrote:

  

>> If you use xsave, I don't see how this is different to the user fpu save
>> area.
>>     
>
> For once there's no clear error handling path for allocation failures
> on the (arbitarily sized) xsave state. On user code that can be barely
> tolerated, but for the kernel it would be deadly.
>   

if (kernel_fpu_begin() < 0)
     goto no_sse;

The question is not if it can be done or not, it's whether making raid 
preemptible is worthwhile, and whether we see/want more sse/avx 
accelerated drivers or not.

-- 
error compiling committee.c: too many arguments to function

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