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

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

>    * Abdel <draconux@gmail.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/

             reply	other threads:[~2008-01-02 13:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-02 13:22 Abdel [this message]
     [not found] <9HagT-66H-21@gated-at.bofh.it>
2008-01-02 12:15 ` Bodo Eggert
  -- strict thread matches above, loose matches on Subject: below --
2008-01-02 11:45 Abdel
2008-01-02 11:49 ` Sam Ravnborg
2008-01-02 12:42 ` DervishD

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