seq_put_hex_ll
seq_put_hex_ll(m, NULL, a->val, 16);
seq_put_hex_ll(m, NULL, start, 8);
seq_put_hex_ll(m, "-", end, 8);
seq_put_hex_ll(m, " ", pgoff, 8);
seq_put_hex_ll(m, " ", MAJOR(dev), 2);
seq_put_hex_ll(m, ":", MINOR(dev), 2);
void seq_put_hex_ll(struct seq_file *m, const char *delimiter,