linux-kernel - Re: [all better] Re: regression: massive trouble with fpu rework

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Message-ID: <20150629130921.GF12383@pd.tnic>
Date:	Mon, 29 Jun 2015 15:09:22 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Lutomirski <luto@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, Dave Hansen <dave@...1.net>
Subject: Re: [all better] Re: regression: massive trouble with fpu rework

On Mon, Jun 29, 2015 at 02:27:23PM +0200, Mike Galbraith wrote:
> With it commented out, and fpu__init_system() either back at previously
> booting position [5] or at original [0], doesn't matter, box is dead,
> but differently.  It stalls after setting clocksource to tsc, and just
> sits there.

... which means that unmasking the CPUID features is absolutely needed
on Linux. Not unmasking probably triggers this original bug which

  066941bd4eeb ("x86: unmask CPUID levels on Intel CPUs")

fixed.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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