linux-kernel - Re: [RFC 6/7] x86: Move kernel_fpu

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Message-ID: <4A39B9AC.30807@zytor.com>
Date:	Wed, 17 Jun 2009 20:51:08 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Ingo Molnar <mingo@...e.hu>, Huang Ying <ying.huang@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC 6/7] x86: Move kernel_fpu_using to asm/i387.h

Herbert Xu wrote:
> On Wed, Jun 17, 2009 at 10:06:44AM -0700, H. Peter Anvin wrote:
> 
>> Huang: if I recall correctly, these functions were originally designed
>> to deal with the fact that VIA processors generate spurious #TS faults
>> due to broken design of the Padlock instructions.  The AES and PCLMUL
>> instructions actually use SSE registers and so will require different
>> structure.
> 
> No irq_ts_save was the one designed for the VIA, the Intel stuff
> does save the FPU state.
> 

Ah, sorry, misremembered.  Great!  Will apply.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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