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Subject: Re: [PATCH] genirq: ARM dyntick cleanup
From: Arjan van de Ven <arjan@infradead.org>
To: Linus Torvalds <torvalds@osdl.org>
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Date: Mon, 03 Jul 2006 19:27:07 +0200
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On Mon, 2006-07-03 at 10:13 -0700, Linus Torvalds wrote:
>         #ifndef xyzzy
>         #define zyzzy() /* empty */
>         #endif
> 

now if you write it as

#define zyzzy() do { ; } while (0)

it even works in a

if (foo())
	zyzzy();
bar();

scenario 

(I know you know that, just pointing that out before people copy your
example :-)