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

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Date:	Fri, 10 Apr 2009 21:34:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Al Viro <viro@...IV.linux.org.uk>,
	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


* Tejun Heo <tj@...nel.org> wrote:

> Long term, I think what Ivan proposed with a bit of addition so 
> that combination of DECLARE_PER_CPU() and static DEFINE_PER_CPU() 
> triggers compile error but I think it's better to do it when 
> converting non-x86 archs to dynamic percpu allocator which is 
> scheduled for the next merge window.  For the time being, how 
> about just moving the generic percpu_*() accessors to 
> linux/percpu.h?  asm-generic/percpu.h is meant to carry generic 
> stuff for low level stuff - declarations, definitions and pointer 
> offset calculation and so on but not for generic interface.
> 
> I currently can't build or test stuff so the patch is not tested 
> at all.  Ingo, can you please test whether this would work?

Yes - but i'm somewhat confused - i frequently cross-built Alpha and 
other architectures as well.

So exactly what problem do we have here - has some devel tree grown 
new use of these APIs in generic code, without waiting for all 
arches to be properly converted?

(sounds of rummaging around)

Oh drat:

| commit 4e69489a0ac11a9b62a25923975bfc370a30eae5
| Author: Eric Dumazet <dada1@...mosbay.com>
| Date:   Sat Apr 4 16:41:09 2009 -0700
|
|     socket: use percpu_add() while updating sockets_in_use

Now i understand the rush ...

Yes, moving the APIs to the generic header should properly expose 
the wrapped default implementations. I'll test your patch in a 
minute.

	Ingo
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