tlb->freed = 0; tlb->fullmm = full_mm_flush;
tlb->need_flush = 0; tlb->fullmm = full_mm_flush;
tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush){        struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);        tlb->mm = mm;        tlb->freed = 0;	tlb->fullmm = full_mm_flush;        return tlb;}