GRBM_VALID_FLAG
barg->gb_flags |= GRBM_VALID_FLAG;
#define IS_ENTRY_VALID(ent) ((ent) && ((ent)->ge_flags & GRBM_VALID_FLAG))
#define IS_BARG_VALID(barg) ((barg)->gb_flags & GRBM_VALID_FLAG)
ent->ge_flags |= GRBM_VALID_FLAG;