why use while(0) to write set_current_state

[Anish Kumar]

> On Jun 16, 2015, at 10:01 PM, 慕冬亮 <mudongliangabcd at gmail.com> wrote:
> 
> I see the macro in the include/linux/sched.h
> #define __set_current_state(state_value)			\
> 	do { current->state = (state_value); } while (0)
> 
> Why define it like this? What's the meaning of while?

Read this and you will know why.
http://kernelnewbies.org/FAQ/DoWhile0

> mudongliang 
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