linux-kernel - Re: [PATCH] percpu-refcount: fix usage of this_cpu

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Message-ID: <alpine.DEB.2.10.1406041217060.12469@gentwo.org>
Date:	Wed, 4 Jun 2014 12:17:31 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Tejun Heo <tj@...nel.org>
cc:	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Anatol Pomozov <anatol.pomozov@...il.com>,
	Benjamin LaHaise <bcrl@...ck.org>, linux-aio@...ck.org,
	Kent Overstreet <kmo@...erainc.com>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] percpu-refcount: fix usage of this_cpu_ops (was Re:
 hanging aio process)

On Wed, 4 Jun 2014, Tejun Heo wrote:

> Urgh... I really don't like the subtleties around __this_cpu_*().
> It's too easy to get it wrong and fail to notice it.  :(

Thats why we added the preemption check logic recently. Wonder why it did
not trigger in this case.


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