linux-kernel - Re: [PATCH 13/16] percpu: remove per_cpu_

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Date:	Fri, 16 Oct 2009 12:23:51 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	"Luck, Tony" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"cebbert@...hat.com" <cebbert@...hat.com>
Subject: Re: [PATCH 13/16] percpu: remove per_cpu__ prefix.

On Thu, 15 Oct 2009, Tejun Heo wrote:

> __ia64_per_cpu_var() is slightly different from this_cpu_read() in
> that the former only works for percpu variables which fall on the
> first percpu page - ie. static percpu vars in the kernel image.  So,
> __ia64_per_cpu_var() is a bit more efficient than this_cpu_read() as
> it doesn't have to compute the address.
>
> So, what we can do is to leave the macro alone for now and then add
> sparse annotation to it later in the patch as it's basically another
> specialized accessor.  How does that sound?

Ok. The macro would be arch specific anyways.

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