#define PERROR(call) perror("usertrace: ERROR: " call)
#define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
#define PERROR(call) perror("usertrace: ERROR: " call)
#define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)