ATA_MAX_PRD
prd = pp->prd + ATA_MAX_PRD * qc->hw_tag;
.sg_tablesize = ATA_MAX_PRD,
.sg_tablesize = ATA_MAX_PRD
u8 dimm_buf[(ATA_PRD_SZ * ATA_MAX_PRD) + 512];
ATA_PRD_TBL_SZ = (ATA_MAX_PRD * ATA_PRD_SZ),
LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
LIBATA_DUMB_MAX_PRD = ATA_MAX_PRD / 4, /* Worst case */