[PATCH 30/46] of: reserved_mem: Add code to use unflattened DT for reserved_mem nodes

[kernel test robot]

Hi Oreoluwa,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on arm64/for-next/core vgupta-arc/for-curr powerpc/next powerpc/fixes jcmvbkbc-xtensa/xtensa-for-next linus/master v6.8-rc2 next-20240131]
[cannot apply to vgupta-arc/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Oreoluwa-Babatunde/of-reserved_mem-Change-the-order-that-reserved_mem-regions-are-stored/20240127-081735
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240126235425.12233-31-quic_obabatun%40quicinc.com
patch subject: [PATCH 30/46] of: reserved_mem: Add code to use unflattened DT for reserved_mem nodes
config: i386-randconfig-141-20240128 (https://download.01.org/0day-ci/archive/20240201/202402010140.VrsPYn0W-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)

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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402010140.VrsPYn0W-lkp@intel.com/

smatch warnings:
drivers/of/of_reserved_mem.c:111 dt_scan_reserved_mem_reg_nodes() warn: unsigned 'node' is never less than zero.

vim +/node +111 drivers/of/of_reserved_mem.c

    98	
    99	/*
   100	 * Save the reserved_mem reg nodes in the reserved_mem array
   101	 */
   102	static void __init dt_scan_reserved_mem_reg_nodes(void)
   103	{
   104		int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
   105		struct device_node *node, *child;
   106		phys_addr_t base, size;
   107		const __be32 *prop;
   108		int len;
   109	
   110		node = of_find_node_by_path("/reserved-memory");
 > 111		if (node < 0) {
   112			pr_err("Reserved memory: Did not find reserved-memory node\n");
   113			return;
   114		}
   115	
   116		for_each_child_of_node(node, child) {
   117			const char *uname;
   118			struct reserved_mem *rmem;
   119	
   120			if (!of_device_is_available(child))
   121				continue;
   122	
   123			prop = of_get_property(child, "reg", &len);
   124			if (!prop) {
   125				rmem = of_reserved_mem_lookup(child);
   126				if (rmem)
   127					rmem->dev_node = child;
   128				continue;
   129			}
   130	
   131			uname = of_node_full_name(child);
   132			if (len && len % t_len != 0) {
   133				pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
   134				       uname);
   135				continue;
   136			}
   137	
   138			base = dt_mem_next_cell(dt_root_addr_cells, &prop);
   139			size = dt_mem_next_cell(dt_root_size_cells, &prop);
   140	
   141			if (size)
   142				fdt_reserved_mem_save_node(child, uname, base, size);
   143		}
   144	}
   145	

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