Hi Andrew, FYI, the error/warning still remains. tree: https://github.com/omap-audio/linux-audio peter/ti-linux-5.4.y/wip head: 66480e4ac3f3e2d48b2d0d5303d26515294636fc commit: 481b3c3bfdc83b10aedb9819d7c9f1dbc122a5da [6747/9999] misc: sram: Add dma-heap-export reserved SRAM area type config: m68k-randconfig-r015-20200709 (attached as .config) compiler: m68k-linux-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 481b3c3bfdc83b10aedb9819d7c9f1dbc122a5da # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>): drivers/misc/sram-dma-heap.c: In function 'dma_heap_mmap': 126 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | ^~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/pgprot_writecombine +126 drivers/misc/sram-dma-heap.c 119 120 static int dma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) 121 { 122 struct sram_dma_heap_buffer *buffer = dmabuf->priv; 123 int ret; 124 125 /* SRAM mappings are not cached */ 127 128 ret = vm_iomap_memory(vma, buffer->paddr, buffer->len); 129 if (ret) 130 pr_err("Could not map buffer to userspace\n"); 131 132 return ret; 133 } 134 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org