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Date: Mon, 9 Mar 2015 18:05:43 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>, Ingo Molnar <mingo@kernel.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Pekka Riikonen <priikone@iki.fi>, Rik van Riel <riel@redhat.com>,
        Suresh Siddha <sbsiddha@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        "Yu, Fenghua" <fenghua.yu@intel.com>,
        Quentin Casasnovas <quentin.casasnovas@oracle.com>
Subject: Re: [PATCH 1/1] x86/fpu: x86/fpu: avoid math_state_restore()
	without used_math() in __restore_xstate_sig()
Message-ID: <20150309170543.GA11388@redhat.com>
References: <54F74F59.5070107@intel.com> <20150305195127.GA12657@redhat.com> <20150307153824.GA25954@redhat.com> <20150307153844.GB25954@redhat.com> <20150309140712.GB12732@pd.tnic> <20150309143436.GA3526@redhat.com> <20150309151837.GC12732@pd.tnic> <20150309162404.GA7833@redhat.com> <20150309165338.GF12732@pd.tnic>
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On 03/09, Borislav Petkov wrote:
>
> On Mon, Mar 09, 2015 at 05:24:04PM +0100, Oleg Nesterov wrote:
> > Well, this is the same thinhg reported by Dave ;)
>
> Am I the only one in thinking that this FPU thing went completely nuts?!
> Just kill it all and let's start from scratch. :-P

And I just found another problem which needs the urgent/stable fix ;)
I'll send the simple patch in a minute...

> > But this too doesn't fix the problem: fpu_finit() is buggy on Dave's
> > machine.
>
> In talking about fpu_finit() - I still have two cleanup patches queued
> from you:
>
> http://git.kernel.org/cgit/linux/kernel/git/bp/bp.git/log/?h=tip-x86-fpu-2

Yes, thanks, but this is just a cosmetic cleanup.

Oleg.