linux-kernel - Re: [PATCH -tip] x86: cpu/intel_cacheinfo.c fix compilation warnings

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Message-ID: <20090414133242.GB27163@elte.hu>
Date:	Tue, 14 Apr 2009 15:32:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Langsdorf <mark.langsdorf@....com>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH -tip] x86: cpu/intel_cacheinfo.c fix compilation
	warnings


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

> fix:
>   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’

you again 'fixed' a warning.

this made you fail to analyze and miss the real reason for this for 
example:

>   arch/x86/kernel/cpu/intel_cacheinfo.c:739: warning: unused variable ‘node’

> -	int node = cpu_to_node(cpu);

the local variable is clearly initialized.

The problem is not with that variable - the problem is most likely 
with the cpu_to_node() macro not creating a reference to the 'cpu' 
variable in a compiler-visible way, in the !NUMA case.

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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