Messages in this thread | | | Date | Wed, 2 Jan 2008 13:42:37 +0100 | From | DervishD <> | Subject | Re: macro _set_base - "do - while(0)" question |
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Hi Abdel :)
* 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).
Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! We are waiting for 13 Feb 2009 23:31:30 +0000 ... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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