linux-kernel - Re: [PATCH 1/1] x86/fpu: x86/fpu: avoid math_state_restore() without used_math() in __restore_xstate

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Message-ID: <20150309170543.GA11388@redhat.com>
Date:	Mon, 9 Mar 2015 18:05:43 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Riikonen <priikone@....fi>,
	Rik van Riel <riel@...hat.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Quentin Casasnovas <quentin.casasnovas@...cle.com>
Subject: Re: [PATCH 1/1] x86/fpu: x86/fpu: avoid math_state_restore()
	without used_math() in __restore_xstate_sig()

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.

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