Hi FelixCuioc,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iommu/next]
[also build test ERROR on linux/master linus/master v5.8-rc7 next-20200730]
[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]

url:    https://github.com/0day-ci/linux/commits/FelixCuioc/iommu-vt-d-Add-support-for-ACPI-device-in-RMRR/20200728-182409
base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: x86_64-randconfig-a014-20200731 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: drivers/iommu/intel/dmar.o: in function `dmar_acpi_bus_add_dev':
>> drivers/iommu/intel/dmar.c:745: undefined reference to `dmar_rmrr_add_acpi_dev'

vim +745 drivers/iommu/intel/dmar.c

   670	
   671	struct dmar_drhd_unit *
   672	dmar_find_matched_drhd_unit(struct pci_dev *dev)
   673	{
   674		struct dmar_drhd_unit *dmaru;
   675		struct acpi_dmar_hardware_unit *drhd;
   676	
   677		dev = pci_physfn(dev);
   678	
   679		rcu_read_lock();
   680		for_each_drhd_unit(dmaru) {
   681			drhd = container_of(dmaru->hdr,
   682					    struct acpi_dmar_hardware_unit,
   683					    header);
   684	
   685			if (dmaru->include_all &&
   686			    drhd->segment == pci_domain_nr(dev->bus))
   687				goto out;
   688	
   689			if (dmar_pci_device_match(dmaru->devices,
   690						  dmaru->devices_cnt, dev))
   691				goto out;
   692		}
   693		dmaru = NULL;
   694	out:
   695		rcu_read_unlock();
   696	
   697		return dmaru;
   698	}
   699	int dmar_acpi_insert_dev_scope(u8 device_number,
   700					struct acpi_device *adev,
   701					void *start, void *end,
   702					struct dmar_dev_scope *devices,
   703					int devices_cnt)
   704	{
   705		struct acpi_dmar_device_scope *scope;
   706		struct device *tmp;
   707		int i;
   708		struct acpi_dmar_pci_path *path;
   709	
   710		for (; start < end; start += scope->length) {
   711			scope = start;
   712			if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_NAMESPACE)
   713				continue;
   714			if (scope->enumeration_id != device_number)
   715				continue;
   716			path = (void *)(scope + 1);
   717			for_each_dev_scope(devices, devices_cnt, i, tmp)
   718				if (tmp == NULL) {
   719					devices[i].bus = scope->bus;
   720					devices[i].devfn = PCI_DEVFN(path->device, path->function);
   721					rcu_assign_pointer(devices[i].dev,
   722							   get_device(&adev->dev));
   723					return 1;
   724				}
   725			WARN_ON(i >= devices_cnt);
   726		}
   727		return 0;
   728	}
   729	static int dmar_acpi_bus_add_dev(u8 device_number, struct acpi_device *adev)
   730	{
   731		struct dmar_drhd_unit *dmaru;
   732		struct acpi_dmar_hardware_unit *drhd;
   733		int ret = 0;
   734	
   735		for_each_drhd_unit(dmaru) {
   736			drhd = container_of(dmaru->hdr,
   737					    struct acpi_dmar_hardware_unit,
   738					    header);
   739			ret = dmar_acpi_insert_dev_scope(device_number, adev, (void *)(drhd+1),
   740							((void *)drhd)+drhd->header.length,
   741							dmaru->devices, dmaru->devices_cnt);
   742			if (ret)
   743				break;
   744		}
 > 745		ret = dmar_rmrr_add_acpi_dev(device_number, adev);
   746	
   747		return ret;
   748	

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