--- arch/s390/include/asm/system.h

+++ arch/s390/include/asm/system.h

@@ -97,7 +97,6 @@ static inline void restore_access_regs(u

extern void account_vtime(struct task_struct *, struct task_struct *);

extern void account_tick_vtime(struct task_struct *);

-extern void account_system_vtime(struct task_struct *);

#ifdef CONFIG_PFAULT

extern void pfault_irq_init(void);