From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
Date: Wed, 23 Nov 2011 08:20:36 +0100
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Cc: Christoph Lameter <cl@linux.com>, Christian Kujau
 <lists@nerdbynature.de>,  Benjamin Herrenschmidt
 <benh@kernel.crashing.org>, "Alex,Shi" <alex.shi@intel.com>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 "linux-mm@kvack.org" <linux-mm@kvack.org>,  Pekka Enberg
 <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>,
 "netdev@vger.kernel.org" <netdev@vger.kernel.org>, Tejun Heo <tj@kernel.org>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <20111123071349.GA1671@x4.trippels.de>
Sender: owner-linux-mm@kvack.org
List-Id: netdev.vger.kernel.org

Le mercredi 23 novembre 2011 =C3=A0 08:13 +0100, Markus Trippelsdorf a
=C3=A9crit :
> On 2011.11.22 at 09:27 +0100, Eric Dumazet wrote:
> > Le mardi 22 novembre 2011 =C3=A0 08:48 +0100, Eric Dumazet a =C3=A9cr=
it :
> >=20
> > > For x86, I wonder if our !X86_FEATURE_CX16 support is correct on SM=
P
> > > machines.
> > >=20
> >=20
> >=20
> > By the way, I wonder why we still emit this_cpu_cmpxchg16b_emu() code
> > and calls when compiling a kernel for a cpu implementing cmpxchg16b
> >=20
> > (CONFIG_MCORE2=3Dy)
>=20
> Yeah, it's strange (CONFIG_MK8):
>=20
> ffffffff811058b0 <__kmalloc>:
> ...
> ffffffff8110594f:       48 8d 4a 04             lea    0x4(%rdx),%rcx
> ffffffff81105953:       49 8b 1c 04             mov    (%r12,%rax,1),%r=
bx
> ffffffff81105957:       4c 89 e0                mov    %r12,%rax
> ffffffff8110595a:       e8 11 70 10 00          callq  ffffffff8120c970=
 <this_cpu_cmpxchg16b_emu>
> ffffffff8110595f:       66 66 90                data32 xchg %ax,%ax
> ffffffff81105962:       84 c0                   test   %al,%al
> ffffffff81105964:       74 c6                   je     ffffffff8110592c=
 <__kmalloc+0x7c>
> ...
>=20

This is patched at bootime (asm alternative)



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