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

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Message-ID: <20090618014858.GA1368@gondor.apana.org.au>
Date:	Thu, 18 Jun 2009 09:48:58 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"H. Peter Anvin" <hpa@...or.com>
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

On Wed, Jun 17, 2009 at 10:06:44AM -0700, H. Peter Anvin wrote:
> Ingo Molnar wrote:
> >>  
> >> +static inline int kernel_fpu_using(void)
> >> +{
> >> +	if (in_interrupt() && !(read_cr0() & X86_CR0_TS))
> >> +		return 1;
> >> +	return 0;
> >> +}
> >> +
> > 
> > Looks sane to me. Herbert, do you ack it?

Ack.  Please pick it up in your tree.  Thanks!

> 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.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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