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Message-ID: <1457630115.5784.1.camel@nexus-software.ie> Date: Thu, 10 Mar 2016 17:15:15 +0000 From: Bryan O'Donoghue <pure.logic@...us-software.ie> To: Borislav Petkov <bp@...en8.de> Cc: Andy Shevchenko <andy.shevchenko@...il.com>, 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, 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@...ileo:~# ./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@...ileo:~#
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