linux-kernel - Re: [GIT PULL] SLAB changes for v2.6.39-rc1

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Date:	Thu, 24 Mar 2011 18:26:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, tj@...nel.org, npiggin@...nel.dk,
	rientjes@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [GIT PULL] SLAB changes for v2.6.39-rc1


* Pekka Enberg <penberg@...nel.org> wrote:

> On Thu, Mar 24, 2011 at 4:41 PM, Christoph Lameter <cl@...ux.com> wrote:
> > On Thu, 24 Mar 2011, Ingo Molnar wrote:
> >
> >> FYI, some sort of boot crash has snuck upstream in the last 24 hours:
> >>
> >>  BUG: unable to handle kernel paging request at ffff87ffc147e020
> >>  IP: [<ffffffff811aa762>] this_cpu_cmpxchg16b_emu+0x2/0x1c
> >
> > Hmmm.. This is the fallback code for the case that the processor does not
> > support cmpxchg16b.
> 
> How does alternative_io() work? Does it require
> alternative_instructions() to be executed. If so, the fallback code
> won't be active when we enter kmem_cache_init(). Is there any reason
> check_bugs() is called so late during boot? Can we do something like
> the totally untested attached patch?

Does the config i sent you boot on your box? I think the bug is pretty generic 
and should trigger on any box.

Thanks,

	Ingo
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