ata_composite
struct ata_composite *acp = obj;
bzero(acp, sizeof(struct ata_composite));
sizeof(struct ata_composite), M_ATA };
struct ata_composite *composite; /* for composite atomic ops */
bzero(composite, sizeof(struct ata_composite)); \
struct ata_composite *cptr;
struct ata_composite *composite;
struct ata_composite *composite;
struct ata_composite *composite;
struct ata_composite *composite = NULL;