[PATCH] ACPI: IORT: validate RMR node array bounds

[kernel test robot]

Hi Pengpeng,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on rafael-pm/bleeding-edge linus/master v7.2-rc6 next-20260804]
[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/Pengpeng-Hou/ACPI-IORT-validate-RMR-node-array-bounds/20260804-123552
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20260706094300.82618-1-pengpeng%40iscas.ac.cn
patch subject: [PATCH] ACPI: IORT: validate RMR node array bounds
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260805/202608050045.wC3xEg9O-lkp@intel.com/config)
compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260805/202608050045.wC3xEg9O-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608050045.wC3xEg9O-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/acpi/arm64/iort.c:199:13: warning: 'iort_rmr_node_valid' defined but not used [-Wunused-function]
     199 | static bool iort_rmr_node_valid(struct acpi_iort_node *node)
         |             ^~~~~~~~~~~~~~~~~~~


vim +/iort_rmr_node_valid +199 drivers/acpi/arm64/iort.c

   198	
 > 199	static bool iort_rmr_node_valid(struct acpi_iort_node *node)
   200	{
   201		struct acpi_iort_rmr *rmr;
   202	
   203		if (node->length < sizeof(*node) + sizeof(*rmr)) {
   204			pr_err(FW_BUG "Truncated RMR node in IORT table\n");
   205			return false;
   206		}
   207	
   208		rmr = (struct acpi_iort_rmr *)node->node_data;
   209		return iort_node_array_valid(node, rmr->rmr_offset, rmr->rmr_count,
   210					     sizeof(struct acpi_iort_rmr_desc),
   211					     sizeof(*node) + sizeof(*rmr),
   212					     "RMR descriptor");
   213	}
   214	

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