2775 int migrate_vma_setup(struct migrate_vma *args)  in migrate_vma_setup()  argument
2777 	long nr_pages = (args->end - args->start) >> PAGE_SHIFT;  in migrate_vma_setup()
2779 	args->start &= PAGE_MASK;  in migrate_vma_setup()
2780 	args->end &= PAGE_MASK;  in migrate_vma_setup()
2781 	if (!args->vma || is_vm_hugetlb_page(args->vma) ||  in migrate_vma_setup()
2782 	    (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))  in migrate_vma_setup()
2786 	if (args->start < args->vma->vm_start ||  in migrate_vma_setup()
2787 	    args->start >= args->vma->vm_end)  in migrate_vma_setup()
2789 	if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)  in migrate_vma_setup()
2791 	if (!args->src || !args->dst)  in migrate_vma_setup()
2794 	memset(args->src, 0, sizeof(*args->src) * nr_pages);  in migrate_vma_setup()
2795 	args->cpages = 0;  in migrate_vma_setup()
2796 	args->npages = 0;  in migrate_vma_setup()
2798 	migrate_vma_collect(args);  in migrate_vma_setup()
2800 	if (args->cpages)  in migrate_vma_setup()
2801 		migrate_vma_prepare(args);  in migrate_vma_setup()
2802 	if (args->cpages)  in migrate_vma_setup()
2803 		migrate_vma_unmap(args);  in migrate_vma_setup()