Hi Catalin,

I love your patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Catalin-Marinas/mm-dma-arm64-Reduce-ARCH_KMALLOC_MINALIGN-to-8/20221107-060303
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20221106220143.2129263-5-catalin.marinas%40arm.com
patch subject: [PATCH v3 04/13] mm/slab: Allow kmalloc() minimum alignment fallback to dma_get_cache_alignment()
config: parisc-randconfig-r003-20221106
compiler: hppa-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/309bc52a1ed9665a1b9d32bcf094918ceb6af519
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Catalin-Marinas/mm-dma-arm64-Reduce-ARCH_KMALLOC_MINALIGN-to-8/20221107-060303
        git checkout 309bc52a1ed9665a1b9d32bcf094918ceb6af519
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   mm/slab_common.c: In function '__kmalloc_minalign':
>> mm/slab_common.c:866:52: error: 'io_tlb_default_mem' undeclared (first use in this function)
     866 |             cache_align < ARCH_KMALLOC_MINALIGN || io_tlb_default_mem.nslabs)
         |                                                    ^~~~~~~~~~~~~~~~~~
   mm/slab_common.c:866:52: note: each undeclared identifier is reported only once for each function it appears in


vim +/io_tlb_default_mem +866 mm/slab_common.c

   856	
   857	static unsigned int __kmalloc_minalign(void)
   858	{
   859		int cache_align = dma_get_cache_alignment();
   860	
   861		/*
   862		 * If CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC is not enabled,
   863		 * ARCH_KMALLOC_MINALIGN matches ARCH_DMA_MINALIGN.
   864		 */
   865		if (!IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) ||
 > 866		    cache_align < ARCH_KMALLOC_MINALIGN || io_tlb_default_mem.nslabs)
   867			return ARCH_KMALLOC_MINALIGN;
   868	
   869		pr_info_once("No default DMA bounce buffer, increasing the kmalloc() minimum alignment to %d\n",
   870			     cache_align);
   871		return cache_align;
   872	}
   873	

-- 
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