--- zzzz-none-000/linux-4.4.60/include/linux/vmacache.h 2017-04-08 07:53:53.000000000 +0000 +++ jet-2400-727/linux-4.4.60/include/linux/vmacache.h 2021-03-17 14:36:41.000000000 +0000 @@ -15,7 +15,6 @@ memset(tsk->vmacache, 0, sizeof(tsk->vmacache)); } -extern void vmacache_flush_all(struct mm_struct *mm); extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma); extern struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr); @@ -29,10 +28,6 @@ static inline void vmacache_invalidate(struct mm_struct *mm) { mm->vmacache_seqnum++; - - /* deal with overflows */ - if (unlikely(mm->vmacache_seqnum == 0)) - vmacache_flush_all(mm); } #endif /* __LINUX_VMACACHE_H */