[linux-next:master 9572/10910] drivers/pci/pci.c:4137:2: error: call to undeclared function 'vunmap_range'; ISO C99 and later do not support implicit function declarations

[linux-next:master 9572/10910] drivers/pci/pci.c:4137:2: error: call to undeclared function 'vunmap_range'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f5f84daefcd92d7a630066635ecea1433ed5eac7
commit: 626ff2b34dbb7679b798f7a4962a8b3def695045 [9572/10910] um: allow deselecting CONFIG_MMU
config: um-randconfig-2001-20260927 (https://download.01.org/0day-ci/archive/20260927/202609270632.WSdFLSK0-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260927/202609270632.WSdFLSK0-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/202609270632.WSdFLSK0-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/pci/pci.c:16:
   In file included from include/linux/iommu.h:10:
   In file included from include/linux/scatterlist.h:9:
   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/pci/pci.c:4137:2: error: call to undeclared function 'vunmap_range'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    4137 |         vunmap_range(vaddr, vaddr + resource_size(res));
         |         ^
   1 warning and 1 error generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for PCI
   Depends on [n]: HAVE_PCI [=y] && MMU [=n]
   Selected by [y]:
   - FORCE_PCI [=y]
   WARNING: unmet direct dependencies detected for PM_GENERIC_DOMAINS_OF
   Depends on [n]: PM_GENERIC_DOMAINS [=y] && OF [=n]
   Selected by [y]:
   - COMMON_CLK_MT8173_MFGTOP [=y] && COMMON_CLK [=y] && (ARCH_MEDIATEK || COMPILE_TEST [=y]) && COMMON_CLK_MT8173 [=y] && PM [=y]


vim +/vunmap_range +4137 drivers/pci/pci.c

8b921acfeffdb0 Liviu Dudau     2014-09-29  4123  
4d3f13845957a8 Sinan Kaya      2016-06-10  4124  /**
4d3f13845957a8 Sinan Kaya      2016-06-10  4125   * pci_unmap_iospace - Unmap the memory mapped I/O space
4d3f13845957a8 Sinan Kaya      2016-06-10  4126   * @res: resource to be unmapped
4d3f13845957a8 Sinan Kaya      2016-06-10  4127   *
74356addc0b32e Bjorn Helgaas   2019-01-09  4128   * Unmap the CPU virtual address @res from virtual address space.  Only
74356addc0b32e Bjorn Helgaas   2019-01-09  4129   * architectures that have memory mapped IO functions defined (and the
74356addc0b32e Bjorn Helgaas   2019-01-09  4130   * PCI_IOBASE value defined) should call this function.
4d3f13845957a8 Sinan Kaya      2016-06-10  4131   */
4d3f13845957a8 Sinan Kaya      2016-06-10  4132  void pci_unmap_iospace(struct resource *res)
4d3f13845957a8 Sinan Kaya      2016-06-10  4133  {
8fe743b5eba0ab Arnd Bergmann   2025-04-23  4134  #if defined(PCI_IOBASE)
4d3f13845957a8 Sinan Kaya      2016-06-10  4135  	unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
4d3f13845957a8 Sinan Kaya      2016-06-10  4136  
4ad0ae8c64ac8f Nicholas Piggin 2021-04-29 @4137  	vunmap_range(vaddr, vaddr + resource_size(res));
4d3f13845957a8 Sinan Kaya      2016-06-10  4138  #endif
4d3f13845957a8 Sinan Kaya      2016-06-10  4139  }
f90b0875463e45 Brian Norris    2017-03-09  4140  EXPORT_SYMBOL(pci_unmap_iospace);
4d3f13845957a8 Sinan Kaya      2016-06-10  4141  

:::::: The code at line 4137 was first introduced by commit
:::::: 4ad0ae8c64ac8f81a3651bca11be7c3cb086df80 mm/vmalloc: remove unmap_kernel_range

:::::: TO: Nicholas Piggin <npiggin@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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https://github.com/intel/lkp-tests/wiki