linux-kernel - Re: [PATCH] unbreak alpha percpu

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Message-ID: <49E450EE.9010502@kernel.org>
Date:	Tue, 14 Apr 2009 18:01:34 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Mike Travis <travis@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH] unbreak alpha percpu

Hello, Martin.

Martin Schwidefsky wrote:
> I would like to get rid of that SHIFT_PERCPU_PTR mess. The patch from
> Ivan will allow this, it uses a dummy variable to void the effect of a
> static modifier for percpu variables in modules. The percpu variable
> itself will be defined non-static, my gut feeling is that this is a
> dirty little trick that might bite us in the future.
> Another solution which I personally would prefer is to ban the use of
> static percpu variables. Then the compiler will use the GOT to get the
> address of percpu variables without any dirty tricks.

Hmmm... even if we can make combination of DECLARE_PER_CPU() and
static DEFINE_PER_CPU() trigger compile error?  That pretty much
implements most of what the programmer intends by "static" but yeah
it's a bit convoluted.

Thanks.

-- 
tejun
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