linux-kernel - Re: macro _set_base - "do

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Message-ID: <60d29d630801020522r737ea96cl7693567298d28aca@mail.gmail.com>
Date:	Wed, 2 Jan 2008 14:22:08 +0100
From:	Abdel <draconux@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: macro _set_base - "do - while(0)" question

2008/1/2, DervishD <lkml@...vishd.net>:

>    * Abdel <draconux@...il.com> dixit:
>    > In file include/asm-i386/system.h,  _set_base and _set_limit use an
>    > useless do ... while(0)
>    >
>    > Why is this needed ?
>
>    Google for "do while swallow semicolon". This looks like an useless and
>    weird construction but it is very useful when it comes to macros (you
>    can define variables inside the block and you can use your macro as any
>    other statement, it won't swallow the semicolon).


thanks to all for your responses :)

-- 
Abdel
http://draconux.free.fr/
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