[avpatel:riscv_trace_acpi_support_v1 15/60] drivers/iommu/riscv/iommu-ir.c:325:13: 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: 3a2ee01e59297777c99794a5887e5e1109bbbf27 [15/60] iommu/riscv: Add guest file irqbypass support
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20260514/202605140751.7BaPMVNq-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/20260514/202605140751.7BaPMVNq-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/202605140751.7BaPMVNq-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/iommu/riscv/iommu-ir.c:10:
   In file included from include/linux/msi.h:24:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   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-ir.c:325:13: error: call to undeclared function 'virt_to_pfn'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     325 |                 .msiptp = virt_to_pfn(domain->msi_root) |
         |                           ^
   drivers/iommu/riscv/iommu-ir.c:325:13: 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 +325 drivers/iommu/riscv/iommu-ir.c

   306	
   307	static void riscv_iommu_ir_msiptp_update(struct riscv_iommu_domain *domain)
   308	{
   309		struct pt_iommu_riscv_64_hw_info pt_info, gstage_info;
   310		struct riscv_iommu_device *iommu, *prev;
   311		struct riscv_iommu_bond *bond;
   312		struct riscv_iommu_dc new_dc;
   313	
   314		pt_iommu_riscv_64_hw_info(&domain->riscvpt, &pt_info);
   315		pt_iommu_riscv_64_hw_info(&domain->gstage_riscvpt, &gstage_info);
   316	
   317		new_dc = (struct riscv_iommu_dc){
   318			.ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) |
   319			      RISCV_IOMMU_PC_TA_V,
   320			.iohgatp = FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_MODE, gstage_info.fsc_iosatp_mode) |
   321				   FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_GSCID, domain->gscid) |
   322				   FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_PPN, gstage_info.ppn),
   323			.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
   324			       FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn),
 > 325			.msiptp = virt_to_pfn(domain->msi_root) |
   326				  FIELD_PREP(RISCV_IOMMU_DC_MSIPTP_MODE,
   327					     RISCV_IOMMU_DC_MSIPTP_MODE_FLAT),
   328			.msi_addr_mask = domain->msi_addr_mask,
   329			.msi_addr_pattern = domain->msi_addr_pattern,
   330		};
   331	
   332		/* Like riscv_iommu_ir_msitbl_inval(), synchronize with riscv_iommu_bond_link() */
   333		smp_mb();
   334	
   335		rcu_read_lock();
   336	
   337		prev = NULL;
   338		list_for_each_entry_rcu(bond, &domain->bonds, list) {
   339			iommu = dev_to_iommu(bond->dev);
   340			if (iommu == prev)
   341				continue;
   342	
   343			riscv_iommu_iodir_update(iommu, bond->dev, &new_dc);
   344			prev = iommu;
   345		}
   346	
   347		rcu_read_unlock();
   348	}
   349	

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