linux-kernel - Re: Linux patch disabling AVX when eagerfpu is turned off

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Date:	Thu, 21 Jan 2016 13:12:30 -0800
From:	Yu-cheng Yu <yu-cheng.yu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Leonid Shatz <leonid.shatz@...ellosystems.com>,
	'Ingo Molnar' <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	'Andy Lutomirski' <luto@...capital.net>,
	'Borislav Petkov' <bp@...en8.de>,
	'Dave Hansen' <dave.hansen@...ux.intel.com>,
	'Fenghua Yu' <fenghua.yu@...el.com>,
	'Linus Torvalds' <torvalds@...ux-foundation.org>,
	'Oleg Nesterov' <oleg@...hat.com>,
	'Peter Zijlstra' <peterz@...radead.org>,
	'Quentin Casasnovas' <quentin.casasnovas@...cle.com>,
	"'Ravi V. Shankar'" <ravi.v.shankar@...el.com>,
	'Sai Praneeth Prakhya' <sai.praneeth.prakhya@...el.com>,
	'Thomas Gleixner' <tglx@...utronix.de>,
	liran.alon@...ellosystems.com, mendel.aizner@...ellosystems.com,
	'Elazar Leibovich' <elazar.leibovich@...ellosystems.com>,
	'Eyal Moscovici' <eyal.moscovici@...ellosystems.com>,
	gil.hoffer@...ellosystems.com
Subject: Re: Linux patch disabling AVX when eagerfpu is turned off - possibly
 not required

On Thu, Jan 21, 2016 at 01:08:18PM -0800, H. Peter Anvin wrote:
> On 01/21/16 13:03, Yu-cheng Yu wrote:
> > Hello Leonid,
> > 
> > You are probably right. Let me check this and get back to you.
> > 
> > Thanks,
> > Yu-cheng
> > 
> 
> The hardware people have gotten back to us and this inconsistency in the
> SDM is unintentional (other places in the SDM has it correctly.)  So we
> should revert this patch.
> 
> 	-hpa
> 
Agree. Thanks Peter and Leonid!