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

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Message-ID: <alpine.DEB.1.10.0810030117280.26504@gandalf.stny.rr.com>
Date:	Fri, 3 Oct 2008 01:20:51 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.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


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.

-- 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
> 
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