linux-kernel - Re: [PATCH -tip] x86: k8.h reference to node in node_to_k8_nb_misc for !CONFIG_K8

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Date:	Tue, 14 Apr 2009 18:52:41 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	x86 maintainers <x86@...nel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Langsdorf <mark.langsdorf@....com>
Subject: Re: [PATCH -tip] x86: k8.h reference to node in node_to_k8_nb_misc
	for !CONFIG_K8_NB


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> Add reference to node in node_to_k8_nb_misc for !CONFIG_K8_NB to make compiler happy.
> 
> So fixes compiler warnings:
>   arch/x86/kernel/cpu/intel_cacheinfo.c: In function ‘show_cache_disable’:
>   arch/x86/kernel/cpu/intel_cacheinfo.c:712: warning: unused variable ‘node’
>   arch/x86/kernel/cpu/intel_cacheinfo.c: In function ‘store_cache_disable’:
>   arch/x86/kernel/cpu/intel_cacheinfo.c:739: warning: unused variable ‘node’
> 
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  arch/x86/include/asm/k8.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/include/asm/k8.h b/arch/x86/include/asm/k8.h
> index c23b3d1..c81e4ee 100644
> --- a/arch/x86/include/asm/k8.h
> +++ b/arch/x86/include/asm/k8.h
> @@ -16,7 +16,7 @@ extern int k8_scan_nodes(unsigned long start, unsigned long end);
>  #define node_to_k8_nb_misc(node) \
>  	(node < num_k8_northbridges) ? k8_northbridges[node] : NULL
>  #else
> -#define node_to_k8_nb_misc(node) NULL
> +#define node_to_k8_nb_misc(node) (node) ? NULL : NULL
>  #endif

Ugh, that's very ugly. I gave you a proper solution:

>> The typical way to solve this is to add a dummy:
>> 
>> 	(void)(cpu)
>> 
>> use to the 'cpu' parameter to the macro definition - or, 
>> (which is a much better solution), to convert it to an 
>> inline function.

	Ingo
--
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