linux-kernel - Re: irq_fpu_usable() is irreliable

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Message-ID: <20151127084145.GA26693@gmail.com>
Date:	Fri, 27 Nov 2015 09:41:45 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Jason A. Donenfeld" <Jason@...c4.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: irq_fpu_usable() is irreliable


* Jason A. Donenfeld <Jason@...c4.com> wrote:

> Hi Ingo,
> 
> The plot thickens, once again.
> 
> > > Also, what CPU does the test system have, Intel or AMD? The FPU behavior can be
> > > very different in the two cases.
> > Intel 3820QM, but inside VMWare Workstation 12.
> 
> Trying this on bare metal, the problem goes away! Though the VM is 4.2
> and my bare metal is 4.3. Perhaps your recent changes did something.
> 
> But more likely, there's some funny business happening with VMWare.
> Any speculation about this? Fascinating issue...

I have no idea unfortunately :-( You might want to take it up with the vmware 
guys.

Thanks,

	Ingo
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