Subject: Re: [PATCH 01/10] percpu: use dynamic percpu allocator as the
 default percpu allocator
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Tejun Heo <tj@kernel.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org,
       mingo@elte.hu, kyle@mcmartin.ca, cl@linux-foundation.org,
       Jesper.Nilsson@axis.com, benh@kernel.crashing.org,
       paulmck@linux.vnet.ibm.com, rusty@rustcorp.com.au,
       torvalds@linux-foundation.org, akpm@linux-foundation.org,
       Paul Mundt <lethal@linux-sh.org>, Russell King <rmk@arm.linux.org.uk>,
       Mikael Starvik <starvik@axis.com>, Ralf Baechle <ralf@linux-mips.org>,
       Bryan Wu <cooloney@kernel.org>, Matthew Wilcox <matthew@wil.cx>,
       Grant Grundler <grundler@parisc-linux.org>,
       Hirokazu Takata <takata@linux-m32r.org>,
       Richard Henderson <rth@twiddle.net>,
       Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
       Heiko Carstens <heiko.carstens@de.ibm.com>
In-Reply-To: <1245825924-30412-2-git-send-email-tj@kernel.org>
References: <1245825924-30412-1-git-send-email-tj@kernel.org>
	 <1245825924-30412-2-git-send-email-tj@kernel.org>
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Date: Wed, 24 Jun 2009 18:47:55 -0500
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On Wed, 2009-06-24 at 15:45 +0900, Tejun Heo wrote:
> This patch makes most !CONFIG_HAVE_SETUP_PER_CPU_AREA archs use
> dynamic percpu allocator.  The first chunk is allocated using
> embedding helper and 8k is reserved for modules.  This ensures that
> the new allocator behaves almost identically to the original allocator
> as long as static percpu variables are concerned, so it shouldn't
> introduce much breakage.
> 
> s390 and alpha use custom SHIFT_PERCPU_PTR() to work around addressing
> range limit the addressing model imposes.  Unfortunately, this breaks
> if the address is specified using a variable, so for now, the two
> archs aren't converted.
> 
> The following architectures are affected by this change.
> 
> * sh
> * arm
> * cris
> * mips
> * sparc(32)
> * blackfin
> * avr32
> * parisc (broken, under investigation)

OK, I thought I'd investigate this.  Unfortunately, your git tree
doesn't build when pulled into head ... could you update?

mm/percpu.c: In function 'setup_per_cpu_areas':
mm/percpu.c:2007: error: too many arguments to function 'pcpu_embed_first_chunk'

James


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