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From: "Bryan O'Donoghue" <pure.logic@nexus-software.ie>
To: Borislav Petkov <bp@alien8.de>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
	Ingo Molnar <mingo@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Oleg Nesterov <oleg@redhat.com>,
	"Yu, Yu-cheng" <yu-cheng.yu@intel.com>
Subject: Re: Got FPU related warning on Intel Quark during boot
Date: Thu, 10 Mar 2016 17:15:15 +0000	[thread overview]
Message-ID: <1457630115.5784.1.camel@nexus-software.ie> (raw)
In-Reply-To: <20160310164924.GC26708@pd.tnic>

On Thu, 2016-03-10 at 17:49 +0100, Borislav Petkov wrote:
> On Thu, Mar 10, 2016 at 03:45:21PM +0000, Bryan O'Donoghue wrote:
> > It works but user-space FPU is broken; something's wrong with the
> > initial state of the FPU regs - it looks as though they aren't
> > being
> > properly initialized and FPU context in the signal handler is wrong
> > too.
> 
> What does your test prog say when you boot linux-next with
> "eagerfpu=off" and *without* my fix?
> 

root@galileo:~# ./fpu 
f is 10.000000 g is 10.100000
Double value is 0.000000
Double value is 0.100000
Double value is 0.200000
^Chandler value of variable is 0.300000
Double value is 0.300000
Double value is 0.400000
^Z
[1]+  Stopped                 ./fpu
root@galileo:~# 

  reply	other threads:[~2016-03-10 17:15 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-10 10:46 Got FPU related warning on Intel Quark during boot Andy Shevchenko
2016-03-10 11:19 ` Ingo Molnar
2016-03-10 12:48   ` Andy Shevchenko
2016-03-10 12:56     ` Borislav Petkov
2016-03-10 13:31       ` Andy Shevchenko
2016-03-10 14:59         ` Borislav Petkov
2016-03-10 15:22           ` Andy Shevchenko
2016-03-10 15:45             ` Bryan O'Donoghue
2016-03-10 16:49               ` Borislav Petkov
2016-03-10 17:15                 ` Bryan O'Donoghue [this message]
2016-03-10 19:06                   ` Borislav Petkov
2016-03-11  1:31               ` Andy Lutomirski
2016-03-11 10:50                 ` Bryan O'Donoghue
2016-03-11  1:39           ` Andy Lutomirski
2016-03-11  9:08             ` Ingo Molnar
2016-03-11  9:48               ` Borislav Petkov
2016-03-11 11:02                 ` Bryan O'Donoghue
2016-03-11 11:26                   ` Borislav Petkov
2016-03-11 11:32                     ` [PATCH] x86/FPU: Fix FPU handling on legacy FPU machines Borislav Petkov
2016-03-11 18:32                       ` Linus Torvalds
2016-03-11 22:03                         ` Borislav Petkov
2016-03-11 22:07                           ` Dave Hansen
2016-03-11 22:20                             ` Borislav Petkov
2016-03-12 17:21                               ` Andy Lutomirski
2016-03-12 17:47                                 ` Borislav Petkov
2016-03-12 12:04                           ` Bryan O'Donoghue
2016-03-12 12:27                             ` Borislav Petkov
2016-03-12 15:17                           ` Ingo Molnar
2016-03-22 22:03                           ` Maciej W. Rozycki
2016-03-12 15:08                         ` Ingo Molnar
2016-03-12 15:12                           ` Ingo Molnar
2016-03-12 15:16                       ` [tip:x86/urgent] x86/fpu: Fix eager-FPU " tip-bot for Borislav Petkov

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