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

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Message-ID: <3877989d0711062250g44e5d0ecq1e4b893fa2bad94a@mail.gmail.com>
Date:	Wed, 7 Nov 2007 14:50:33 +0800
From:	"Luming Yu" <luming.yu@...il.com>
To:	"Simon Horman" <horms@...ge.net.au>
Cc:	"David Miller" <davem@...emloft.net>, 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

NAK for now.

I'm trying to add lockdep , so please don't delete it until it could
be proved really useless...
Please don't hurry...

On 11/7/07, Simon Horman <horms@...ge.net.au> wrote:
> 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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