linux-kernel - Re: [PATCH] FRV: Fix the section attribute on UP DECLARE_PER

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Message-ID: <20090422091226.GA18226@elte.hu>
Date:	Wed, 22 Apr 2009 11:12:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Howells <dhowells@...hat.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>, tj@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH] FRV: Fix the section attribute on UP DECLARE_PER_CPU()


* David Howells <dhowells@...hat.com> wrote:

> Any idea what this:
> 
> 	#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)
> 
> is intended for?

it is a mixed type of percpu variable: which is per CPU but which 
can (and will) also be accessed from other CPUs. This way we 
basically cache-line align it and make sure nearby percpu variables 
dont get caught up in any cacheline bounces. It was introduced a 
couple of years ago.

	Ingo
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