}
 
        for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
-               iop_send_queue[IOP_NUM_SCC][i] = 0;
-               iop_send_queue[IOP_NUM_ISM][i] = 0;
+               iop_send_queue[IOP_NUM_SCC][i] = NULL;
+               iop_send_queue[IOP_NUM_ISM][i] = NULL;
                iop_listeners[IOP_NUM_SCC][i].devname = NULL;
                iop_listeners[IOP_NUM_SCC][i].handler = NULL;
                iop_listeners[IOP_NUM_ISM][i].devname = NULL;
 
 
        local_irq_save(flags);
 
-       req->next = 0;
+       req->next = NULL;
        req->sent = 0;
        req->complete = 0;
        req->reply_len = 0;
 
                return -EINVAL;
        }
        
-       req->next = 0;
+       req->next = NULL;
        req->sent = 0;
        req->complete = 0;
        req->reply_len = 0;
        unsigned long flags;
 
        local_irq_save(flags);
-       if (via[IFR] & SR_INT) macii_interrupt(0, 0, 0);
+       if (via[IFR] & SR_INT) macii_interrupt(0, NULL, NULL);
        local_irq_restore(flags);
 }
 
 
                req->complete = 1;
                return -EINVAL;
        }
-       req->next = 0;
+       req->next = NULL;
        req->sent = 0;
        req->complete = 0;
        req->reply_len = 0;
 
        local_irq_save(flags);
        if (via[IFR] & SR_INT) {
-               maciisi_interrupt(0, 0, 0);
+               maciisi_interrupt(0, NULL, NULL);
        }
        else /* avoid calling this function too quickly in a loop */
                udelay(ADB_DELAY);
 
                return -EINVAL;
        }
 
-       req->next = 0;
+       req->next = NULL;
        req->sent = 0;
        req->complete = 0;
        local_irq_save(flags);
                                printk(KERN_ERR "PMU: extra ADB reply\n");
                                return;
                        }
-                       req_awaiting_reply = 0;
+                       req_awaiting_reply = NULL;
                        if (len <= 2)
                                req->reply_len = 0;
                        else {
 
         lp->lance.name = (char*)d->name;                /* discards const, shut up gcc */
         lp->lance.base = va;
         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
-        lp->lance.lance_init_block = 0;                 /* LANCE addr of same RAM */
+        lp->lance.lance_init_block = NULL;              /* LANCE addr of same RAM */
         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
         lp->lance.irq = d->ipl;
         lp->lance.writerap = hplance_writerap;
 
        dev->stop = &lance_close;
        dev->get_stats = &lance_get_stats;
        dev->set_multicast_list = &set_multicast_list;
-       dev->set_mac_address = 0;
+       dev->set_mac_address = NULL;
 //     KLUDGE -- REMOVE ME
        set_bit(__LINK_STATE_PRESENT, &dev->state);
 
 
         */
 
        cmd = (struct scsi_cmnd *) hostdata->input_Q;
-       prev = 0;
+       prev = NULL;
        while (cmd) {
                if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
                        break;
  */
 
        tmp = (struct scsi_cmnd *) hostdata->input_Q;
-       prev = 0;
+       prev = NULL;
        while (tmp) {
                if (tmp == cmd) {
                        if (prev)
 
 
 static int virtual_dma_count=0;
 static int virtual_dma_residue=0;
-static char *virtual_dma_addr=0;
+static char *virtual_dma_addr=NULL;
 static int virtual_dma_mode=0;
 static int doing_pdma=0;
 
 
 
        if(!once) {
                once = 1;
-               error = request_irq(FLOPPY_IRQ, sun3xflop_hardint, SA_INTERRUPT, "floppy", 0);
+               error = request_irq(FLOPPY_IRQ, sun3xflop_hardint, SA_INTERRUPT, "floppy", NULL);
                return ((error == 0) ? 0 : -1);
        } else return 0;
 }
        *sun3x_fdc.fcr_r = 0;
 
        /* Success... */
-       floppy_set_flags(0, 1, FD_BROKEN_DCL); // I don't know how to detect this.
+       floppy_set_flags(NULL, 1, FD_BROKEN_DCL); // I don't know how to detect this.
        allowed_drive_mask = 0x01;
        return (int) SUN3X_FDC;
 }