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

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Message-ID: <AANLkTik3rkNvLG-rgiWxKaPc-v9sZQq96ok0CXfAU+r_@mail.gmail.com>
Date:	Thu, 24 Mar 2011 20:55:54 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Ingo Molnar <mingo@...e.hu>,
	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

On Thu, Mar 24, 2011 at 8:47 PM, Christoph Lameter <cl@...ux.com> wrote:
>
> On Thu, 24 Mar 2011, Eric Dumazet wrote:
>
>> > this_cpu_cmpxchg16b_emu:
>> >         pushf
>> >         cli
>> >
>> >         cmpq %gs:(%rsi), %rax
>
>> Random guess
>>
>> Masking interrupts, and accessing vmalloc() based memory for the first
>> time ?
>
> Hmmm.. Could be. KVM would not really disable interrupts so this may
> explain that the test case works here.
>
> Simple fix would be to do a load before the cli I guess.

Btw, I tried Ingo's .config and it doesn't boot here so it's somehow
.config related.
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