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

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Message-ID: <49DF935E.8030607@kernel.org>
Date:	Fri, 10 Apr 2009 11:43:42 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	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>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] unbreak alpha percpu

Linus Torvalds wrote:
> 
> On Fri, 10 Apr 2009, Ivan Kokshaysky wrote:
>> Actually, all of this has been discussed on lkml; here is the latest
>> variant that makes everybody more or less happy, at least there are
>> no objections from percpu folks and Martin (similar fix should work
>> for s390 as well).
> 
> Is there any reason why this version of DEFINE_PER_CPU_SECTION wouldn't 
> work on _any_ architecture? IOW, do we even need the #ifdef's and 
> per-arch #define?

It should work for all archs but only alpha and s390 require __weak__
and other archs can use actual static or global definitions, but then
again we'll need to add the __per_cpu_multiple_def_ thing to make sure
no two static definitions clash anyway, so there isn't much point in
keeping things separate.

I was waiting for responses on the original thread.  Is everyone okay
with having the 'static per-cpu variables in different compile units
can't have the same name' restriction?

Thanks.

-- 
tejun
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