1static int ok(int *a, int *b)
2{
3	return a - b;
4}
5
6struct s {
7	int a, b, c;
8};
9
10static int ko(struct s *a, struct s *b)
11{
12	return a - b;
13}
14
15/*
16 * check-name: ptr-sub-blows
17 * check-command: sparse -Wptr-subtraction-blows $file
18 *
19 * check-error-start
20ptr-sub-blows.c:12:18: warning: potentially expensive pointer subtraction
21ptr-sub-blows.c:12:18:     'struct s' has a non-power-of-2 size: 12
22 * check-error-end
23 */
24