[davidhildenbrand:fork_pat 1/1] include/linux/pgtable.h:1525:13: error: unused function 'untrack_pfn_copy'

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

tree:   https://github.com/davidhildenbrand/linux fork_pat
head:   4474ef40921c064454fd03245526fc80f373873e
commit: 4474ef40921c064454fd03245526fc80f373873e [1/1] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range()
config: powerpc-randconfig-001-20250325 (https://download.01.org/0day-ci/archive/20250325/202503250935.Gm7ENdAr-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project c2692afc0a92cd5da140dfcdfff7818a5b8ce997)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250325/202503250935.Gm7ENdAr-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/202503250935.Gm7ENdAr-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from lib/test_bitops.c:12:
   In file included from include/linux/slab.h:256:
   In file included from include/linux/kasan.h:37:
>> include/linux/pgtable.h:1525:13: error: unused function 'untrack_pfn_copy' [-Werror,-Wunused-function]
    1525 | static void untrack_pfn_copy(struct vm_area_struct *dst_vma, unsigned long pfn)
         |             ^~~~~~~~~~~~~~~~
   1 error generated.


vim +/untrack_pfn_copy +1525 include/linux/pgtable.h

  1520	
  1521	/*
  1522	 * untrack_pfn_copy is called when a VM_PFNMAP VMA failed to copy during
  1523	 * copy_page_range(), but after track_pfn_copy() was already called.
  1524	 */
> 1525	static void untrack_pfn_copy(struct vm_area_struct *dst_vma, unsigned long pfn)
  1526	{
  1527	}
  1528	

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