linux-kernel - Re: Got FPU related warning on Intel Quark during boot

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Message-ID: <CAHp75Vep=e3HWHHJh-Z6Q9yr8dik715ctbthABxf2Grbuf7jow@mail.gmail.com>
Date:	Thu, 10 Mar 2016 15:31:43 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Yu, Yu-cheng" <yu-cheng.yu@...el.com>
Subject: Re: Got FPU related warning on Intel Quark during boot

On Thu, Mar 10, 2016 at 2:56 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Mar 10, 2016 at 02:48:09PM +0200, Andy Shevchenko wrote:
>> He-he, my cursor stays on
>>         if (!use_eager_fpu() || !static_cpu_has(X86_FEATURE_FPU)) {
>> while I was having a lunch. So far got from datasheet that some kind
>> of FPU is present there.
>>
>> eagerfpu=auto doesn't fix
>> eagerfpu=off fixes the issue
>
> Looking at the stacktrace, does that quark thing have FXRSTOR?
>
> $ grep -i fxsr /proc/cpuinfo

Looks like it lacks that one.

# grep -i fxsr /proc/cpuinfo; echo $?
1

-- 
With Best Regards,
Andy Shevchenko