linux-kernel - Re: [PATCH][RFC] Add default CPU topology information

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Date:	Fri, 18 Apr 2008 13:10:17 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH][RFC] Add default CPU topology information

Andrew Morton wrote:
> On Mon, 31 Mar 2008 12:44:13 +0100 Ben Hutchings <bhutchings@...arflare.com> wrote:
> 
> > Not all architectures and configurations define CPU topology information.
> > This can result in an empty topology directory in sysfs, and requires
> > in-kernel users to protect all uses with #ifdef - see
> > <http://marc.info/?l=linux-netdev&m=120639033904472&w=2>.
> > 
> > The documentation of CPU topology specifies what the defaults should be
> > if only partial information is available from the hardware.  So we can
> > provide these defaults as a fallback.
> 
> powerpc allmodconfig:
> 
> arch/powerpc/kernel/pci_64.c:655: error: expected identifier or '(' before 'void'
> arch/powerpc/kernel/pci_64.c:655: error: expected ')' before '(' token
<snip 
> gets it working, by tricking the preprocessor into expanding pcibus_to_node
> to itself, but it isn't exactly pleasing.

No, it isn't!  But cputopology.txt does say these should be macros, not
functions.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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