[PATCH] riscv: mm: still create swiotlb buffer for kmalloc() bouncing if required

[kernel test robot]

Hi Jisheng,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.7-rc2 next-20231124]
[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/Jisheng-Zhang/riscv-mm-still-create-swiotlb-buffer-for-kmalloc-bouncing-if-required/20231127-014531
base:   linus/master
patch link:    https://lore.kernel.org/r/20231126162528.2411-1-jszhang%40kernel.org
patch subject: [PATCH] riscv: mm: still create swiotlb buffer for kmalloc() bouncing if required
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20231127/202311270934.fETTDQTa-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231127/202311270934.fETTDQTa-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311270934.fETTDQTa-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/riscv/mm/init.c:171:6: error: use of undeclared identifier 'dma_cache_alignment'; did you mean 'dma_get_cache_alignment'?
     171 |             dma_cache_alignment != 1) {
         |             ^~~~~~~~~~~~~~~~~~~
         |             dma_get_cache_alignment
   include/linux/dma-mapping.h:541:19: note: 'dma_get_cache_alignment' declared here
     541 | static inline int dma_get_cache_alignment(void)
         |                   ^
   1 error generated.


vim +171 arch/riscv/mm/init.c

   169	
   170		if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb &&
 > 171		    dma_cache_alignment != 1) {
   172			/*
   173			 * If no bouncing needed for ZONE_DMA, allocate 1MB swiotlb
   174			 * buffer per 1GB of RAM for kmalloc() bouncing on
   175			 * non-coherent platforms.
   176			 */
   177			unsigned long size =
   178				DIV_ROUND_UP(memblock_phys_mem_size(), 1024);
   179			swiotlb_adjust_size(min(swiotlb_size_or_default(), size));
   180			swiotlb = true;
   181		}
   182	
   183		swiotlb_init(swiotlb, SWIOTLB_VERBOSE);
   184		memblock_free_all();
   185	
   186		print_vm_layout();
   187	}
   188	

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