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Message-ID: <1322032836.1298.39.camel@edumazet-laptop>
Date: Wed, 23 Nov 2011 08:20:36 +0100
From: Eric Dumazet <eric.dumazet@...il.com>
To: Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc: Christoph Lameter <cl@...ux.com>,
Christian Kujau <lists@...dbynature.de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
"Alex,Shi" <alex.shi@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
Pekka Enberg <penberg@...nel.org>,
Matt Mackall <mpm@...enic.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Tejun Heo <tj@...nel.org>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
Le mercredi 23 novembre 2011 à 08:13 +0100, Markus Trippelsdorf a
écrit :
> On 2011.11.22 at 09:27 +0100, Eric Dumazet wrote:
> > Le mardi 22 novembre 2011 à 08:48 +0100, Eric Dumazet a écrit :
> >
> > > For x86, I wonder if our !X86_FEATURE_CX16 support is correct on SMP
> > > machines.
> > >
> >
> >
> > 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
> >
> > (CONFIG_MCORE2=y)
>
> Yeah, it's strange (CONFIG_MK8):
>
> ffffffff811058b0 <__kmalloc>:
> ...
> ffffffff8110594f: 48 8d 4a 04 lea 0x4(%rdx),%rcx
> ffffffff81105953: 49 8b 1c 04 mov (%r12,%rax,1),%rbx
> 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>
> ...
>
This is patched at bootime (asm alternative)
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