compat_floppy_fdc_state
#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
struct compat_floppy_fdc_state __user *arg)
struct compat_floppy_fdc_state v32;
memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))