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

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Message-ID: <20080418122427.GN21637@solarflare.com>
Date:	Fri, 18 Apr 2008 13:24:28 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.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.
> > 
> > This patch:
> > 
> > - Adds default definitions of the 4 topology macros to
> >   include/asm-generic/topology.h.
> > - Changes include/asm-*/topology.h to include <asm-generic/topology.h>
> >   unconditionally.
> > - Changes drivers/base/topology.c to use the topology macros unconditionally
> >   and to cope with definitions that aren't lvalues.
> > - Updates documentation accordingly.
> 
> I get a huuuuuuuge crash early in boot on the t61p dual x86_64 laptop. 
> Before netconsole has started and it has no serial port, so all I have is a
> partially-scrolled-off jpg, sorry.
>
> I'll drop the patch.
<snip>

Damn, x86 is also using functions instead of macros.  Sorry about that; I'll
have another try.

Ben.

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