linux-kernel - Re: [PATCH 3/7] percpu: clean up percpu variable definitions

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Message-Id: <200905251537.35981.rusty@rustcorp.com.au>
Date:	Mon, 25 May 2009 15:37:34 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, x86@...nel.org,
	ink@...assic.park.msu.ru, rth@...ddle.net, linux@....linux.org.uk,
	hskinnemoen@...el.com, cooloney@...nel.org, starvik@...s.com,
	jesper.nilsson@...s.com, dhowells@...hat.com,
	ysato@...rs.sourceforge.jp, tony.luck@...el.com,
	takata@...ux-m32r.org, geert@...ux-m68k.org, monstr@...str.eu,
	ralf@...ux-mips.org, kyle@...artin.ca, benh@...nel.crashing.org,
	paulus@...ba.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, lethal@...ux-sh.org,
	davem@...emloft.net, jdike@...toit.com, chris@...kel.net,
	Jens Axboe <jens.axboe@...cle.com>,
	Dave Jones <davej@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	"linux-mm" <linux-mm@...ck.org>
Subject: Re: [PATCH 3/7] percpu: clean up percpu variable definitions

On Wed, 20 May 2009 05:07:35 pm Tejun Heo wrote:
> Percpu variable definition is about to be updated such that
>
> * percpu symbols must be unique even the static ones
>
> * in-function static definition is not allowed

That spluttering noise is be choking on the title of this patch :)

Making these pseudo statics is in no way a cleanup.  How about we just
say "they can't be static" and do something like:

/* Sorry, can't be static: that breaks archs which need these weak. */
#define DEFINE_PER_CPU(type, var) \
	extern typeof(type) var; DEFINE_PER_CPU_SECTION(type, name, "")

Thanks,
Rusty.
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