[ragnatech:next/net/tsn 4/5] drivers/net/ethernet/renesas/rtsn.c:270:9: error: implicit declaration of function '__iowmb'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/niklas/linux.git next/net/tsn
head:   9929703c4bd6c8c37ff9c65353ea241101007b52
commit: 2aec3957074d82d65a9df406a07631e6a81e7a98 [4/5] net: ethernet: rtsn: Add support for Renesas Ethernet-TSN
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20231127/202311271132.APTExKBp-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231127/202311271132.APTExKBp-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311271132.APTExKBp-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/net/ethernet/renesas/rtsn.c: In function 'rtsn_poll':
>> drivers/net/ethernet/renesas/rtsn.c:270:9: error: implicit declaration of function '__iowmb' [-Werror=implicit-function-declaration]
     270 |         __iowmb();
         |         ^~~~~~~
   cc1: some warnings being treated as errors


vim +/__iowmb +270 drivers/net/ethernet/renesas/rtsn.c

   244	
   245	static int rtsn_poll(struct napi_struct *napi, int budget)
   246	{
   247		struct rtsn_private *priv;
   248		struct net_device *ndev;
   249		unsigned long flags;
   250		int quota = budget;
   251	
   252		ndev = napi->dev;
   253		priv = netdev_priv(ndev);
   254	
   255		/* Processing RX Descriptor Ring */
   256		if (rtsn_rx(ndev, &quota))
   257			goto out;
   258	
   259		/* Processing TX Descriptor Ring */
   260		spin_lock_irqsave(&priv->lock, flags);
   261		rtsn_tx_free(ndev, true);
   262		netif_wake_subqueue(ndev, 0);
   263		spin_unlock_irqrestore(&priv->lock, flags);
   264	
   265		napi_complete(napi);
   266	
   267		/* Re-enable TX/RX interrupts */
   268		spin_lock_irqsave(&priv->lock, flags);
   269		rtsn_ctrl_data_irq(priv, true);
 > 270		__iowmb();
   271		spin_unlock_irqrestore(&priv->lock, flags);
   272	out:
   273		return budget - quota;
   274	}
   275	

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