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

[Kotian, Deepak]

Just for information, may be very simple.

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.

Thanks and Regards
Deepak



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