linux-kernel - Re: [PATCH] fix typo in per_cpu

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Date:	Wed, 7 Nov 2007 15:44:31 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	David Miller <davem@...emloft.net>
Cc:	luming.yu@...il.com, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] fix typo in per_cpu_offset

On Tue, Oct 30, 2007 at 05:50:56PM +0900, Simon Horman wrote:
> On Tue, Oct 30, 2007 at 12:36:22AM -0700, David Miller wrote:
> > From: Simon Horman <horms@...ge.net.au>
> > Date: Tue, 30 Oct 2007 16:15:13 +0900
> > 
> > > Though curiuously with my config nothing uses per_cpu_offset()
> > > (I added a bogus call to produce an error.) Is it actually
> > > used on ia64?
> > 
> > It is unused, and in that regard should probably be deleted.
> > 
> > include/asm-generic/percpu.h defines a seemingly similarly
> > unused per_cpu_offset() macro define as well
> 
> It looks like they were both added by "[PATCH] lockdep: add per_cpu_offset()"
> (a875a69f8b00a38b4f40d9632a4fc71a159f0e0d)
> 
> Perhaps they were used at that time?

I looked into this a little further:

I'm pretty much convinced that the asm-ia64 version of per_cpu_offset()
is unused as ia64 doesn't have lockdep. I will send a patch to get rid
of it. The generic version might be used on mips, sh or arm with
CONFIG_SMP, as these architectures have lockdep. I did managed to
produce a compiler error on mips by removing the asm-generic version of
per_cpu_offset().

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/

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