Re: macro _set_base - "do - while(0)" question

[Abdel]

2008/1/2, DervishD <lkml@xxxxxxxxxxxx>:

>    * Abdel <draconux@xxxxxxxxx> 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/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/