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Subject: Re: Linux patch disabling AVX when eagerfpu is turned off - possibly
 not required
To: Yu-cheng Yu <yu-cheng.yu@intel.com>,
        Leonid Shatz <leonid.shatz@ravellosystems.com>
References: <02fd01d15437$233056c0$69910440$@ravellosystems.com>
 <20160121210320.GA9236@test-lenovo>
Cc: "'Ingo Molnar'" <mingo@kernel.org>, linux-kernel@vger.kernel.org,
        "'Andy Lutomirski'" <luto@amacapital.net>,
        "'Borislav Petkov'" <bp@alien8.de>,
        "'Dave Hansen'" <dave.hansen@linux.intel.com>,
        "'Fenghua Yu'" <fenghua.yu@intel.com>,
        "'Linus Torvalds'" <torvalds@linux-foundation.org>,
        "'Oleg Nesterov'" <oleg@redhat.com>,
        "'Peter Zijlstra'" <peterz@infradead.org>,
        "'Quentin Casasnovas'" <quentin.casasnovas@oracle.com>,
        "'Ravi V. Shankar'" <ravi.v.shankar@intel.com>,
        "'Sai Praneeth Prakhya'" <sai.praneeth.prakhya@intel.com>,
        "'Thomas Gleixner'" <tglx@linutronix.de>,
        liran.alon@ravellosystems.com, mendel.aizner@ravellosystems.com,
        "'Elazar Leibovich'" <elazar.leibovich@ravellosystems.com>,
        "'Eyal Moscovici'" <eyal.moscovici@ravellosystems.com>,
        gil.hoffer@ravellosystems.com
From: "H. Peter Anvin" <hpa@zytor.com>
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Date: Thu, 21 Jan 2016 13:08:18 -0800
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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