arch_dup_task_struct
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
int arch_dup_task_struct(struct task_struct *dst,
err = arch_dup_task_struct(tsk, orig);