tree: git://git.infradead.org/users/hch/misc.git arm-dma-direct-cleanups head: 4b440e9e6735af2889653a5384243f2d261293cb commit: 4b440e9e6735af2889653a5384243f2d261293cb [28/28] ARM/dma-mapping: remove the arm specific phys to dma translation helpers config: arm-spear6xx_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 git checkout 4b440e9e6735af2889653a5384243f2d261293cb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/arm/mm/dma-mapping.c: In function 'arm_dma_supported': 196 | return dma_to_pfn(dev, mask) >= max_dma_pfn; | ^~~~~~~~~~ | dma_to_phys arch/arm/mm/dma-mapping.c: At top level: arch/arm/mm/dma-mapping.c:392:13: warning: no previous prototype for 'dma_contiguous_early_fixup' [-Wmissing-prototypes] 392 | void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc arm-dma-direct-cleanups git checkout 4b440e9e6735af2889653a5384243f2d261293cb vim +196 arch/arm/mm/dma-mapping.c 2dc6a016bbedf18 Marek Szyprowski 2012-02-10 181 fd27a526bb381f4 Christoph Hellwig 2020-02-17 182 /* fd27a526bb381f4 Christoph Hellwig 2020-02-17 183 * Return whether the given device DMA address mask can be supported fd27a526bb381f4 Christoph Hellwig 2020-02-17 184 * properly. For example, if your device can only drive the low 24-bits fd27a526bb381f4 Christoph Hellwig 2020-02-17 185 * during bus mastering, then you would pass 0x00ffffff as the mask fd27a526bb381f4 Christoph Hellwig 2020-02-17 186 * to this function. fd27a526bb381f4 Christoph Hellwig 2020-02-17 187 */ fd27a526bb381f4 Christoph Hellwig 2020-02-17 188 static int arm_dma_supported(struct device *dev, u64 mask) fd27a526bb381f4 Christoph Hellwig 2020-02-17 189 { fd27a526bb381f4 Christoph Hellwig 2020-02-17 190 unsigned long max_dma_pfn = min(max_pfn - 1, arm_dma_pfn_limit); fd27a526bb381f4 Christoph Hellwig 2020-02-17 191 fd27a526bb381f4 Christoph Hellwig 2020-02-17 192 /* fd27a526bb381f4 Christoph Hellwig 2020-02-17 193 * Translate the device's DMA mask to a PFN limit. This fd27a526bb381f4 Christoph Hellwig 2020-02-17 194 * PFN number includes the page which we can DMA to. fd27a526bb381f4 Christoph Hellwig 2020-02-17 195 */ fd27a526bb381f4 Christoph Hellwig 2020-02-17 @196 return dma_to_pfn(dev, mask) >= max_dma_pfn; fd27a526bb381f4 Christoph Hellwig 2020-02-17 197 } fd27a526bb381f4 Christoph Hellwig 2020-02-17 198 :::::: The code at line 196 was first introduced by commit :::::: fd27a526bb381f43dded6db30b3b016468ab0e6c ARM/dma-mapping: merge __dma_supported into arm_dma_supported :::::: TO: Christoph Hellwig <hch(a)lst.de&gt; :::::: CC: Christoph Hellwig <hch(a)lst.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org