[avpatel:riscv_trace_acpi_support_v1 7/60] drivers/iommu/riscv/iommu.c:1181:15: error: call to undeclared function 'virt_to_pfn'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/avpatel/linux.git riscv_trace_acpi_support_v1
head:   893faf8dbff9fe0958fb1f32b778914af0fa1b45
commit: 636d6f4d6f412057412d72bfa4751cf2e760b0ad [7/60] iommu/riscv: Add IRQ domain for interrupt remapping
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20260513/202605132339.J4ujGoJH-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260513/202605132339.J4ujGoJH-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/202605132339.J4ujGoJH-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/iommu/riscv/iommu.c:18:
   In file included from include/linux/crash_dump.h:5:
   In file included from include/linux/kexec.h:20:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1209 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> drivers/iommu/riscv/iommu.c:1181:15: error: call to undeclared function 'virt_to_pfn'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1181 |                 dc.msiptp = virt_to_pfn(domain->msi_root) |
         |                             ^
   drivers/iommu/riscv/iommu.c:1181:15: note: did you mean 'virt_to_pte'?
   arch/um/include/asm/pgtable.h:284:15: note: 'virt_to_pte' declared here
     284 | extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
         |               ^
   1 warning and 1 error generated.


vim +/virt_to_pfn +1181 drivers/iommu/riscv/iommu.c

  1155	
  1156	static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain,
  1157						    struct device *dev,
  1158						    struct iommu_domain *old)
  1159	{
  1160		struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
  1161		struct riscv_iommu_device *iommu = dev_to_iommu(dev);
  1162		struct riscv_iommu_info *info = dev_iommu_priv_get(dev);
  1163		struct pt_iommu_riscv_64_hw_info pt_info;
  1164		struct riscv_iommu_dc dc = {0};
  1165		int ret;
  1166	
  1167		pt_iommu_riscv_64_hw_info(&domain->riscvpt, &pt_info);
  1168	
  1169		if (!riscv_iommu_pt_supported(iommu, pt_info.fsc_iosatp_mode))
  1170			return -ENODEV;
  1171	
  1172		ret = riscv_iommu_ir_attach_paging_domain(domain, dev);
  1173		if (ret)
  1174			return ret;
  1175	
  1176		dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
  1177			 FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn);
  1178		dc.ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) | RISCV_IOMMU_PC_TA_V;
  1179	
  1180		if (domain->msi_root) {
> 1181			dc.msiptp = virt_to_pfn(domain->msi_root) |
  1182				    FIELD_PREP(RISCV_IOMMU_DC_MSIPTP_MODE,
  1183					       RISCV_IOMMU_DC_MSIPTP_MODE_FLAT);
  1184			dc.msi_addr_mask = domain->msi_addr_mask;
  1185			dc.msi_addr_pattern = domain->msi_addr_pattern;
  1186		}
  1187	
  1188		if (riscv_iommu_bond_link(domain, dev))
  1189			return -ENOMEM;
  1190	
  1191		riscv_iommu_iodir_update(iommu, dev, &dc);
  1192		riscv_iommu_bond_unlink(info->domain, dev);
  1193		info->domain = domain;
  1194	
  1195		return 0;
  1196	}
  1197	

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