[rppt:hugetlb-init/v0 15/26] arch/powerpc/mm/mem.c:223:19: error: use of undeclared identifier 'zone_dma_bits'; did you mean 'zone_dma_limit'?

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git hugetlb-init/v0
head:   8f1fbf04ce5ef30eb770231992ca055d4f45e5a7
commit: c4213ce62b5b611f3c28bdd8be9b6f0b15130071 [15/26] powerpc: introduce arch_zone_limits_init()
config: powerpc-pmac32_defconfig (https://download.01.org/0day-ci/archive/20251220/202512202240.GHqlQPrw-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project b324c9f4fa112d61a553bf489b5f4f7ceea05ea8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251220/202512202240.GHqlQPrw-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/202512202240.GHqlQPrw-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/powerpc/mm/mem.c:223:19: error: use of undeclared identifier 'zone_dma_bits'; did you mean 'zone_dma_limit'?
     223 |                                       1UL << (zone_dma_bits - PAGE_SHIFT));
         |                                               ^~~~~~~~~~~~~
         |                                               zone_dma_limit
   include/linux/minmax.h:105:41: note: expanded from macro 'min'
     105 | #define min(x, y)       __careful_cmp(min, x, y)
         |                                               ^
   include/linux/minmax.h:98:28: note: expanded from macro '__careful_cmp'
      98 |         __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |                                   ^
   include/linux/minmax.h:92:28: note: expanded from macro '__careful_cmp_once'
      92 |         auto ux = (x); auto uy = (y);                   \
         |                                   ^
   include/linux/dma-direct.h:15:12: note: 'zone_dma_limit' declared here
      15 | extern u64 zone_dma_limit;
         |            ^
   1 error generated.


vim +223 arch/powerpc/mm/mem.c

   206	
   207	/*
   208	 * Zones usage:
   209	 *
   210	 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
   211	 * everything else. GFP_DMA32 page allocations automatically fall back to
   212	 * ZONE_DMA.
   213	 *
   214	 * By using 31-bit unconditionally, we can exploit zone_dma_limit to inform the
   215	 * generic DMA mapping code.  32-bit only devices (if not handled by an IOMMU
   216	 * anyway) will take a first dip into ZONE_NORMAL and get otherwise served by
   217	 * ZONE_DMA.
   218	 */
   219	void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
   220	{
   221	#ifdef CONFIG_ZONE_DMA
   222		max_zone_pfns[ZONE_DMA]	= min(max_low_pfn,
 > 223					      1UL << (zone_dma_bits - PAGE_SHIFT));
   224	#endif
   225		max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
   226	#ifdef CONFIG_HIGHMEM
   227		max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
   228	#endif
   229	}
   230	

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