Hi John, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: 5c7b701be7dead87f48760244e31cf0e1597542b commit: f853204a169c95e2c5cb469c4528aeec6b1b59a2 [1743/7336] dma-buf: heaps: Move heap-helper logic into the cma_heap implementation config: mips-allyesconfig (attached as .config) compiler: mips-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 # https://github.com/intel/linux-intel-lts/commit/f853204a169c95e2c5cb469c4... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.10/yocto git checkout f853204a169c95e2c5cb469c4528aeec6b1b59a2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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/dma-buf/heaps/cma_heap.c: In function 'cma_heap_do_vmap': 185 | vaddr = vmap(buffer->pages, buffer->pagecount, VM_MAP, PAGE_KERNEL); | ^~~~ | kmap 185 | vaddr = vmap(buffer->pages, buffer->pagecount, VM_MAP, PAGE_KERNEL); | ^~~~~~ | VM_MTE drivers/dma-buf/heaps/cma_heap.c:185:49: note: each undeclared identifier is reported only once for each function it appears in drivers/dma-buf/heaps/cma_heap.c: In function 'cma_heap_vunmap': 225 | vunmap(buffer->vaddr); | ^~~~~~ | kunmap cc1: some warnings being treated as errors vim +185 drivers/dma-buf/heaps/cma_heap.c 180 181 static void *cma_heap_do_vmap(struct cma_heap_buffer *buffer) 182 { 183 void *vaddr; 184 186 if (!vaddr) 187 return ERR_PTR(-ENOMEM); 188 189 return vaddr; 190 } 191 192 static int cma_heap_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map) 193 { 194 struct cma_heap_buffer *buffer = dmabuf->priv; 195 void *vaddr; 196 int ret = 0; 197 198 mutex_lock(&buffer->lock); 199 if (buffer->vmap_cnt) { 200 buffer->vmap_cnt++; 201 dma_buf_map_set_vaddr(map, buffer->vaddr); 202 goto out; 203 } 204 205 vaddr = cma_heap_do_vmap(buffer); 206 if (IS_ERR(vaddr)) { 207 ret = PTR_ERR(vaddr); 208 goto out; 209 } 210 buffer->vaddr = vaddr; 211 buffer->vmap_cnt++; 212 dma_buf_map_set_vaddr(map, buffer->vaddr); 213 out: 214 mutex_unlock(&buffer->lock); 215 216 return ret; 217 } 218 219 static void cma_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) 220 { 221 struct cma_heap_buffer *buffer = dmabuf->priv; 222 223 mutex_lock(&buffer->lock); 224 if (!--buffer->vmap_cnt) { 226 buffer->vaddr = NULL; 227 } 228 mutex_unlock(&buffer->lock); 229 dma_buf_map_clear(map); 230 } 231 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org