alist_free
alist_free(bl, 0, size);
alist_free(bl, da, count);
alist_free(bl, da, count);
alist_free(bl, blk + count, ncount - count);
void alist_free(alist_t, alist_blk_t, alist_blk_t);
alist_free(&vm_contig_alist, blk, size);
alist_free(&vm_contig_alist, start, pages);
alist_free(&vm_contig_alist, pa >> PAGE_SHIFT, 1);