Re: [PATCH v1 3/6] vfio/nvgrace-gpu: Add support for huge pfnmap

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

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on awilliam-vfio/next]
[also build test WARNING on awilliam-vfio/for-linus linus/master v6.18-rc6 next-20251118]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/ankita-nvidia-com/vfio-nvgrace-gpu-Use-faults-to-map-device-memory/20251117-205950
base:   https://github.com/awilliam/linux-vfio.git next
patch link:    https://lore.kernel.org/r/20251117124159.3560-4-ankita%40nvidia.com
patch subject: [PATCH v1 3/6] vfio/nvgrace-gpu: Add support for huge pfnmap
config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20251118/202511181317.hOMn5k0o-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511181317.hOMn5k0o-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/202511181317.hOMn5k0o-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/vfio/pci/nvgrace-gpu/main.c: In function 'nvgrace_gpu_aligned_devmem_size':
>> drivers/vfio/pci/nvgrace-gpu/main.c:179:7: warning: 'CONFIG_ARCH_SUPPORTS_PUD_PFNMAP' is not defined, evaluates to '0' [-Wundef]
     179 | #elif CONFIG_ARCH_SUPPORTS_PUD_PFNMAP
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +179 drivers/vfio/pci/nvgrace-gpu/main.c

   174	
   175	static size_t nvgrace_gpu_aligned_devmem_size(size_t memlength)
   176	{
   177	#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
   178		return ALIGN(memlength, PMD_SIZE);
 > 179	#elif CONFIG_ARCH_SUPPORTS_PUD_PFNMAP
   180		return ALIGN(memlength, PUD_SIZE);
   181	#endif
   182		return memlength;
   183	}
   184	

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