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

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Date:	Thu, 24 Mar 2011 13:47:23 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Pekka Enberg <penberg@...nel.org>, 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, 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.

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