kthread_exit(9) unexpectedness

[Julian Elischer]

Lawrence Stewart wrote:

> 
> I agree that the arrangement needs to be better documented. The change 
> in 8.x is subtle enough that reading the kthread man page in 7.x and 8.x 
> doesn't immediately make it obvious what's going on.
> 

I tried to walk the fine line between being completely incompatible 
and letting people fall into a trap.

The arguments and prototypes are different so code should fail to 
compile unless people have made changes to their code..