linux-kernel - Re: [PATCH] x86 Topology cpu_to

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Date:	Fri, 3 Oct 2008 11:56:05 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com, "Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Martin Bligh <mbligh@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] x86 Topology cpu_to_node parameter check

* Steven Rostedt (rostedt@...dmis.org) wrote:
> 
> On Fri, 3 Oct 2008, Mathieu Desnoyers wrote:
> 
> > ---
> >  include/asm-x86/topology.h |    6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > Index: linux-2.6-lttng/include/asm-x86/topology.h
> > ===================================================================
> > --- linux-2.6-lttng.orig/include/asm-x86/topology.h	2008-10-03 00:37:05.000000000 -0400
> > +++ linux-2.6-lttng/include/asm-x86/topology.h	2008-10-03 00:45:52.000000000 -0400
> > @@ -182,9 +182,9 @@ extern int __node_distance(int, int);
> >  
> >  #else /* !CONFIG_NUMA */
> >  
> > -#define numa_node_id()		0
> > -#define	cpu_to_node(cpu)	0
> > -#define	early_cpu_to_node(cpu)	0
> > +#define	numa_node_id()		0
> > +#define	cpu_to_node(cpu)	((void)(cpu),0)
> > +#define	early_cpu_to_node(cpu)	cpu_to_node(cpu)
> 
> Actually the proper way would be to have:
> 
> static inline int cpu_to_node(int cpu)
> {
> 	return 0;
> }
> 
> static inline int early_cpu_to_node(int cpu)
> {
> 	return 0;
> }
> 
> This way you also get typechecks.
> 

That's how I did it first, but then I looked at asm-generic/topology.h
and have seen it uses #defines. Should we change them too ?

Mathieu

> -- Steve
> 
> >  
> >  static inline const cpumask_t *_node_to_cpumask_ptr(int node)
> >  {
> > -- 
> > Mathieu Desnoyers
> > OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> > 
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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