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

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Date:	Wed, 25 Mar 2009 13:22:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, 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


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

> > With your patches and a RELOC_HIDE version that uses the GOTENT 
> > indirection the kernel won't compile because the "X" constraint 
> > for the GOTENT access needs a symbol and there are quite a few 
> > users that pass a pointer. I do not see a simple solution for 
> > that problem yet.
> 
> Ah... okay.  Now I get it.  It wasn't expecting variables there.  How
> about doing the following?
> 
>  #define SHIFT_PERCPU_PTR(ptr, offset) (({				\
> 	 if (__builtin_constant_p(ptr))					\
> 		 do GOTENT trick;					\
> 	 else								\
> 		 RELOC_HIDE();						\
>  }))
> 
> Thanks.

Btw., is there any intermediate fix/workaround i could apply 
perhaps? I'd like to send the percpu bits early in the merge window 
and would hate to break Martin's arch ...

	Ingo
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