Re: [PATCH net-next v2 4/8] net: rpmsg-eth: Add basic rpmsg skeleton

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

Hi MD,

kernel test robot noticed the following build errors:

[auto build test ERROR on 2fd4161d0d2547650d9559d57fc67b4e0a26a9e3]

url:    https://github.com/intel-lab-lkp/linux/commits/MD-Danish-Anwar/dt-bindings-net-ti-rpmsg-eth-Add-DT-binding-for-RPMSG-ETH/20250902-171411
base:   2fd4161d0d2547650d9559d57fc67b4e0a26a9e3
patch link:    https://lore.kernel.org/r/20250902090746.3221225-5-danishanwar%40ti.com
patch subject: [PATCH net-next v2 4/8] net: rpmsg-eth: Add basic rpmsg skeleton
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20250903/202509032343.1y6JMbSq-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509032343.1y6JMbSq-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/202509032343.1y6JMbSq-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   drivers/net/ethernet/rpmsg_eth.c: In function 'rpmsg_eth_get_shm_info':
>> drivers/net/ethernet/rpmsg_eth.c:88:29: error: implicit declaration of function 'devm_ioremap' [-Werror=implicit-function-declaration]
      88 |         common->port->shm = devm_ioremap(common->dev, rmem->base, rmem->size);
         |                             ^~~~~~~~~~~~
>> drivers/net/ethernet/rpmsg_eth.c:88:27: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      88 |         common->port->shm = devm_ioremap(common->dev, rmem->base, rmem->size);
         |                           ^
   cc1: some warnings being treated as errors


vim +/devm_ioremap +88 drivers/net/ethernet/rpmsg_eth.c

    34	
    35	/**
    36	 * rpmsg_eth_get_shm_info - Retrieve shared memory region for RPMsg Ethernet
    37	 * @common: Pointer to rpmsg_eth_common structure
    38	 *
    39	 * This function locates and maps the reserved memory region for the RPMsg
    40	 * Ethernet device by traversing the device tree hierarchy. It first identifies
    41	 * the associated remote processor (rproc), then locates the "rpmsg-eth" child
    42	 * node within the rproc's device tree node, and finally retrieves the
    43	 * "memory-region" phandle that points to the reserved memory region.
    44	 * Once found, the shared memory region is mapped into the
    45	 * kernel's virtual address space using devm_ioremap()
    46	 *
    47	 * Return: 0 on success, negative error code on failure.
    48	 */
    49	static int rpmsg_eth_get_shm_info(struct rpmsg_eth_common *common)
    50	{
    51		struct device_node *np, *rpmsg_eth_node, *rmem_np;
    52		struct reserved_mem *rmem;
    53		struct rproc *rproc;
    54	
    55		/* Get the remote processor associated with this device */
    56		rproc = rproc_get_by_child(&common->rpdev->dev);
    57		if (!rproc) {
    58			dev_err(common->dev, "rpmsg eth device not child of rproc\n");
    59			return -EINVAL;
    60		}
    61	
    62		/* Get the device node from rproc or its parent */
    63		np = rproc->dev.of_node ?: (rproc->dev.parent ? rproc->dev.parent->of_node : NULL);
    64		if (!np) {
    65			dev_err(common->dev, "Cannot find rproc device node\n");
    66			return -ENODEV;
    67		}
    68	
    69		/* Get the rpmsg-eth child node */
    70		rpmsg_eth_node = of_get_child_by_name(np, "rpmsg-eth");
    71		if (!rpmsg_eth_node) {
    72			dev_err(common->dev, "Couldn't get rpmsg-eth node from np\n");
    73			return -ENODEV;
    74		}
    75	
    76		/* Parse the memory-region phandle */
    77		rmem_np = of_parse_phandle(rpmsg_eth_node, "memory-region", 0);
    78		of_node_put(rpmsg_eth_node);
    79		if (!rmem_np)
    80			return -EINVAL;
    81	
    82		/* Lookup the reserved memory region */
    83		rmem = of_reserved_mem_lookup(rmem_np);
    84		of_node_put(rmem_np);
    85		if (!rmem)
    86			return -EINVAL;
    87	
  > 88		common->port->shm = devm_ioremap(common->dev, rmem->base, rmem->size);
    89		if (IS_ERR(common->port->shm))
    90			return PTR_ERR(common->port->shm);
    91	
    92		common->port->buf_size = rmem->size;
    93	
    94		return 0;
    95	}
    96	

-- 
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