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Date: Mon, 9 Mar 2015 16:18:37 +0100
From: Borislav Petkov <bp@suse.de>
To: Oleg Nesterov <oleg@redhat.com>
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: <20150309151837.GC12732@pd.tnic>
References: <54F74F59.5070107@intel.com>
 <20150305195127.GA12657@redhat.com>
 <20150307153824.GA25954@redhat.com>
 <20150307153844.GB25954@redhat.com>
 <20150309140712.GB12732@pd.tnic>
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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.
--