linux-kernel - Re: [GIT RFC] percpu: use dynamic percpu allocator as the default percpu allocator

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Date:	Wed, 25 Mar 2009 22:34:46 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	Ingo Molnar <mingo@...e.hu>, rusty@...tcorp.com.au,
	tglx@...utronix.de, x86@...nel.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, Paul Mundt <lethal@...ux-sh.org>,
	rmk@....linux.org.uk, starvik@...s.com, ralf@...ux-mips.org,
	davem@...emloft.net, cooloney@...nel.org, kyle@...artin.ca,
	matthew@....cx, grundler@...isc-linux.org, takata@...ux-m32r.org,
	benh@...nel.crashing.org, rth@...ddle.net,
	ink@...assic.park.msu.ru, heiko.carstens@...ibm.com
Subject: Re: [GIT RFC] percpu: use dynamic percpu allocator as the default
 percpu allocator

Martin Schwidefsky wrote:
> On Wed, 25 Mar 2009 22:21:03 +0900
> Tejun Heo <tj@...nel.org> wrote:
> 
>> Martin Schwidefsky wrote:
>>>> Martin's original patch should do the trick although it would be
>>>> slower for static symbols.  I'll merge it and post the tree.
>>> No, my original patch doesn't work. It will break modules that use
>>> static per-cpu variables.
>> Oops.  Even with the default offset adding macros?  Heh... I think it
>> would be best to wait for your fix then.
> 
> We could use HAVE_LEGACY_PER_CPU_AREA for the time being. 

Eh...  The thing is that the patch kills the legacy default allocator.
We can move it into arch/s390 for the time being but it would be
simpler if the constant_p thing or something else could work.  :-) Do
you think figuring out how to fix it will take long?

Thanks.

-- 
tejun
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