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Date: Fri, 02 Nov 2001 11:09:49 +0100
From: Giacomo Catenazzi <cate@debian.org>
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To: Andreas Dilger <adilger@turbolabs.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: [CHECKER] Is this a bug?
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> 
> Also (in a separate patch at the end) is the removal of a whole bunch of:
> 
> #ifdef IP2DEBUG_TRACE
> 	ip2trace(foo);
> #endif
> 
> and replacing it with (the Linus-preferred, and far cleaner):
> 
> #ifdef IP2DEBUG_TRACE
> void ip2trace(foo)
> #else
> #define ip2trace(foo) do {} while (0)
> #endif
> 

Why in Linux we use "do {} while (0)" instead of the
standard "(void)0" ?
(standard = as normal libc in <assert.h>)

do while(0) is used for multiple statment macro to avoid problem
in if-else, not for empty instructions.


	giacomo

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