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: <20150309151837.GC12732@pd.tnic>
Date:	Mon, 9 Mar 2015 16:18:37 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Oleg Nesterov <oleg@...hat.com>
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 Mon, Mar 09, 2015 at 03:34:36PM +0100, Oleg Nesterov wrote:
> The patch only fixes the problem with irqs disabled, I tested this.
> 
> The problem with fpu_init/XRSTORS is another thing...

Yet another thing?! Oh boy.

So first Dave reported the #GP, which got fixed by Quentin's patch.
After it, it triggered the rwsem.c bug above. If this patch fixes it,
what is the third problem?

-- 
Regards/Gruss,
    Boris.

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