Re: [PATCH 13/16] iommu: observability of the IOMMU allocations

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

Hi Pasha,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on awilliam-vfio/for-linus linus/master v6.7-rc3]
[cannot apply to joro-iommu/next awilliam-vfio/next next-20231130]
[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/Pasha-Tatashin/iommu-vt-d-add-wrapper-functions-for-page-allocations/20231129-054908
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20231128204938.1453583-14-pasha.tatashin%40soleen.com
patch subject: [PATCH 13/16] iommu: observability of the IOMMU allocations
config: sparc64-randconfig-r054-20231130 (https://download.01.org/0day-ci/archive/20231130/202311302108.WERv9oSO-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/202311302108.WERv9oSO-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/202311302108.WERv9oSO-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/iommu/iommufd/iova_bitmap.c:11:
   drivers/iommu/iommufd/../iommu-pages.h: In function '__iommu_alloc_account':
>> drivers/iommu/iommufd/../iommu-pages.h:29:48: error: 'NR_IOMMU_PAGES' undeclared (first use in this function)
      29 |         mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, pgcnt);
         |                                                ^~~~~~~~~~~~~~
   drivers/iommu/iommufd/../iommu-pages.h:29:48: note: each undeclared identifier is reported only once for each function it appears in
   drivers/iommu/iommufd/../iommu-pages.h: In function '__iommu_free_account':
   drivers/iommu/iommufd/../iommu-pages.h:41:48: error: 'NR_IOMMU_PAGES' undeclared (first use in this function)
      41 |         mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, -pgcnt);
         |                                                ^~~~~~~~~~~~~~


vim +/NR_IOMMU_PAGES +29 drivers/iommu/iommufd/../iommu-pages.h

    13	
    14	/*
    15	 * All page allocation that are performed in the IOMMU subsystem must use one of
    16	 * the functions below.  This is necessary for the proper accounting as IOMMU
    17	 * state can be rather large, i.e. multiple gigabytes in size.
    18	 */
    19	
    20	/**
    21	 * __iommu_alloc_account - account for newly allocated page.
    22	 * @pages: head struct page of the page.
    23	 * @order: order of the page
    24	 */
    25	static inline void __iommu_alloc_account(struct page *pages, int order)
    26	{
    27		const long pgcnt = 1l << order;
    28	
  > 29		mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, pgcnt);
    30	}
    31	

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