net: tulip: avoid unused variable warning

There is an effort to achieve W=1 kernel builds without warnings.
As part of that effort Helge Deller highlighted the following warnings
in the tulip driver when compiling with W=1 and CONFIG_TULIP_MWI=n:

  .../tulip_core.c: In function ‘tulip_init_one’:
  .../tulip_core.c:1309:22: warning: variable ‘force_csr0’ set but not used

This patch addresses that problem using IS_ENABLED(). This approach has
the added benefit of reducing conditionally compiled code. And thus
increasing compile coverage. E.g. for allmodconfig builds which enable
CONFIG_TULIP_MWI.

Compile tested only.
No run-time effect intended.

Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250318-tulip-w1-v3-1-a813fadd164d@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
index 27e01d780cd02eaf9c8a3488ca0f9df5b36159ce..75eac18ff2466d64e75ade6577610996f38a8990 100644 (file)
--- a/drivers/net/ethernet/dec/tulip/tulip_core.c
+++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
@@ -1177,7 +1177,6 @@ static void set_rx_mode(struct net_device *dev)
        iowrite32(csr6, ioaddr + CSR6);
 }
 
-#ifdef CONFIG_TULIP_MWI
 static void tulip_mwi_config(struct pci_dev *pdev, struct net_device *dev)
 {
        struct tulip_private *tp = netdev_priv(dev);
@@ -1251,7 +1250,6 @@ out:
                netdev_dbg(dev, "MWI config cacheline=%d, csr0=%08x\n",
                           cache, csr0);
 }
-#endif
 
 /*
  *     Chips that have the MRM/reserved bit quirk and the burst quirk. That
@@ -1463,10 +1461,9 @@ static int tulip_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
        INIT_WORK(&tp->media_work, tulip_tbl[tp->chip_id].media_task);
 
-#ifdef CONFIG_TULIP_MWI
-       if (!force_csr0 && (tp->flags & HAS_PCI_MWI))
+       if (IS_ENABLED(CONFIG_TULIP_MWI) && !force_csr0 &&
+           (tp->flags & HAS_PCI_MWI))
                tulip_mwi_config (pdev, dev);
-#endif
 
        /* Stop the chip's Tx and Rx processes. */
        tulip_stop_rxtx(tp);