2642 int migrate_vma_setup(struct migrate_vma *args)  in migrate_vma_setup()  argument
2644 	long nr_pages = (args->end - args->start) >> PAGE_SHIFT;  in migrate_vma_setup()
2646 	args->start &= PAGE_MASK;  in migrate_vma_setup()
2647 	args->end &= PAGE_MASK;  in migrate_vma_setup()
2648 	if (!args->vma || is_vm_hugetlb_page(args->vma) ||  in migrate_vma_setup()
2649 	    (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))  in migrate_vma_setup()
2653 	if (args->start < args->vma->vm_start ||  in migrate_vma_setup()
2654 	    args->start >= args->vma->vm_end)  in migrate_vma_setup()
2656 	if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)  in migrate_vma_setup()
2658 	if (!args->src || !args->dst)  in migrate_vma_setup()
2661 	memset(args->src, 0, sizeof(*args->src) * nr_pages);  in migrate_vma_setup()
2662 	args->cpages = 0;  in migrate_vma_setup()
2663 	args->npages = 0;  in migrate_vma_setup()
2665 	migrate_vma_collect(args);  in migrate_vma_setup()
2667 	if (args->cpages)  in migrate_vma_setup()
2668 		migrate_vma_prepare(args);  in migrate_vma_setup()
2669 	if (args->cpages)  in migrate_vma_setup()
2670 		migrate_vma_unmap(args);  in migrate_vma_setup()