tree: https://android.googlesource.com/kernel/common android-4.19 head: 983e2cdf34d065dd89e93bd096a76994b29aebcd commit: f64a8b79c0e85440319136ed928f22ed37481742 [1/4] ANDROID: staging: android: ion: enable modularizing the ion driver config: x86_64-randconfig-a015-20201118 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2613fb2f0f53691dd0211895afbb9413457fca7) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-4.19 git checkout f64a8b79c0e85440319136ed928f22ed37481742 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): int ion_system_heap_create(void) ^ drivers/staging/android/ion/ion_system_heap.c:292:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int ion_system_heap_create(void) ^ static int ion_system_contig_heap_create(void) ^ drivers/staging/android/ion/ion_system_heap.c:385:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int ion_system_contig_heap_create(void) ^ static 2 warnings generated. vim +/ion_system_heap_create +292 drivers/staging/android/ion/ion_system_heap.c 291 293 { 294 struct ion_heap *heap; 295 296 heap = __ion_system_heap_create(); 297 if (IS_ERR(heap)) 298 return PTR_ERR(heap); 299 heap->name = "ion_system_heap"; 300 301 ion_device_add_heap(heap); 302 return 0; 303 } 304 305 static int ion_system_contig_heap_allocate(struct ion_heap *heap, 306 struct ion_buffer *buffer, 307 unsigned long len, 308 unsigned long flags) 309 { 310 int order = get_order(len); 311 struct page *page; 312 struct sg_table *table; 313 unsigned long i; 314 int ret; 315 316 page = alloc_pages(low_order_gfp_flags | __GFP_NOWARN, order); 317 if (!page) 318 return -ENOMEM; 319 320 split_page(page, order); 321 322 len = PAGE_ALIGN(len); 323 for (i = len >> PAGE_SHIFT; i < (1 << order); i++) 324 __free_page(page + i); 325 326 table = kmalloc(sizeof(*table), GFP_KERNEL); 327 if (!table) { 328 ret = -ENOMEM; 329 goto free_pages; 330 } 331 332 ret = sg_alloc_table(table, 1, GFP_KERNEL); 333 if (ret) 334 goto free_table; 335 336 sg_set_page(table->sgl, page, len, 0); 337 338 buffer->sg_table = table; 339 340 return 0; 341 342 free_table: 343 kfree(table); 344 free_pages: 345 for (i = 0; i < len >> PAGE_SHIFT; i++) 346 __free_page(page + i); 347 348 return ret; 349 } 350 351 static void ion_system_contig_heap_free(struct ion_buffer *buffer) 352 { 353 struct sg_table *table = buffer->sg_table; 354 struct page *page = sg_page(table->sgl); 355 unsigned long pages = PAGE_ALIGN(buffer->size) >> PAGE_SHIFT; 356 unsigned long i; 357 358 for (i = 0; i < pages; i++) 359 __free_page(page + i); 360 sg_free_table(table); 361 kfree(table); 362 } 363 364 static struct ion_heap_ops kmalloc_ops = { 365 .allocate = ion_system_contig_heap_allocate, 366 .free = ion_system_contig_heap_free, 367 .map_kernel = ion_heap_map_kernel, 368 .unmap_kernel = ion_heap_unmap_kernel, 369 .map_user = ion_heap_map_user, 370 }; 371 372 static struct ion_heap *__ion_system_contig_heap_create(void) 373 { 374 struct ion_heap *heap; 375 376 heap = kzalloc(sizeof(*heap), GFP_KERNEL); 377 if (!heap) 378 return ERR_PTR(-ENOMEM); 379 heap->ops = &kmalloc_ops; 380 heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG; 381 heap->name = "ion_system_contig_heap"; 382 return heap; 383 } 384 386 { 387 struct ion_heap *heap; 388 389 heap = __ion_system_contig_heap_create(); 390 if (IS_ERR(heap)) 391 return PTR_ERR(heap); 392 393 ion_device_add_heap(heap); 394 return 0; 395 } 396 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org