kcpc_overflow_intr
if ((ctx = kcpc_overflow_intr(arg1, bitmap)) != NULL) {
extern kcpc_ctx_t *kcpc_overflow_intr(caddr_t arg, uint64_t bitmap);
extern kcpc_ctx_t *kcpc_overflow_intr(caddr_t arg, uint64_t bitmap);
extern kcpc_ctx_t *kcpc_overflow_intr(caddr_t arg, uint64_t bitmap);