free_pgd_range
free_pgd_range(&tlb, patching_addr, patching_addr + PAGE_SIZE, 0, 0);
free_pgd_range(&tlb, start, end, start, end);
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
free_pgd_range(tlb, addr, vma->vm_end, unmap->pg_start,
free_pgd_range(&tlb, new_end, old_end, new_end,
free_pgd_range(&tlb, old_start, old_end, new_end,