Re: Purpose of do{}while(0) in #define spin_lock_init(x) do {(x)->lock = 0; } while(0)

[Paolo Ornati]

On Wed, 5 Jan 2005 19:31:44 +0530
"Kotian, Deepak" <Deepak.Kotian@xxxxxxxxx> wrote:

> Is there any specific reason why do{}while(0) is 
> there in this definition
> #define spin_lock_init(x)	do { (x)->lock = 0; } while(0)
> 
> What could happen if it is replaced by
> #define spin_lock_init(x)	{ (x)->lock = 0; } 
> 
> There are couple of other places, where this kind of usage
> is observed in the kernel code.

look at http://www.kernelnewbies.org/faq/

-- 
	Paolo Ornati
	Gentoo Linux (kernel 2.6.10-cko2)
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