linux-kernel - Re: [guv v2 04/31] net: Replace __get_cpu

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Message-ID: <00000140e431ded7-d71fb5bf-5a5c-418f-83e5-0e6e2f2fea9d-000000@email.amazonses.com>
Date:	Tue, 3 Sep 2013 14:20:08 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	David Howells <dhowells@...hat.com>
cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-arch@...r.kernel.org, Steven Rostedt <srostedt@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [guv v2 04/31] net: Replace __get_cpu_var uses

On Mon, 2 Sep 2013, David Howells wrote:

> Would it be possible to use __thread annotations for per-CPU variables, I
> wonder?

We already have a __percpu annotation. Looked at __thread a couple of
years ago but found that support for the kernel segment register was not
available. If we had __thread then most of the operations could simply be
provided by the compiler.



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