Arguments

Description

If a kernel thread is launched as a result of a system call, or if it ever exits, it should generally reparent itself to kthreadd so it isn't in the way of other processes and is correctly cleaned up on exit.

The various task state such as scheduling policy and priority may have been inherited from a user process, so we reset them to sane values here.

NOTE that reparent_to_kthreadd gives the caller full capabilities.