1 static int ok(int *a, int *b) 2 { 3 return a - b; 4 } 5 6 struct s { 7 int a, b, c; 8 }; 9 10 static 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 20 ptr-sub-blows.c:12:18: warning: potentially expensive pointer subtraction 21 ptr-sub-blows.c:12:18: 'struct s' has a non-power-of-2 size: 12 22 * check-error-end 23 */ 24