Hi Pankaj, FYI, the error/warning still remains. tree: https://github.com/Freescale/linux-fslc pr/475 head: ba04c793cdee9a8f7a2d7641cd652cebfd6a438e commit: b57b8221587134978fbcd522e87aab6f44fea710 [13126/14916] s4muap arm: fix for compilation issue. config: riscv-randconfig-r031-20211015 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6069a6a5049497a32a50a49661c2f4169078bdba) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/Freescale/linux-fslc/commit/b57b8221587134978fbcd522e8... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc pr/475 git checkout b57b8221587134978fbcd522e87aab6f44fea710 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 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/firmware/imx/s400-api.c:245:16: warning: no previous prototype for function 'imx_soc_device_register' [-Wmissing-prototypes] struct device *imx_soc_device_register(void) ^ drivers/firmware/imx/s400-api.c:245:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct device *imx_soc_device_register(void) ^ static __cpuc_flush_dcache_area((void *) s, e); ^ 1 warning and 1 error generated. vim +/__cpuc_flush_dcache_area +455 drivers/firmware/imx/s400-api.c 338 339 static int s4_muap_ioctl_get_info(struct s4_mu_device_ctx *dev_ctx, 340 unsigned long arg) 341 { 342 struct imx_s400_api *s400_muap_priv = dev_ctx->s400_muap_priv; 343 struct s4_read_info info; 344 345 int ret = -EINVAL; 346 347 ret = (int)copy_from_user(&info, (u8 *)arg, 348 sizeof(info)); 349 if (ret) { 350 devctx_err(dev_ctx, "Fail copy shared memory config to user\n"); 351 ret = -EFAULT; 352 goto exit; 353 } 354 355 s400_muap_priv->tx_msg.header = (s400_muap_priv->cmd_tag << 24) | 356 (info.cmd_id << 16) | 357 (info.size << 8) | 358 S400_VERSION; 359 360 ret = imx_s400_api_call(s400_muap_priv, (void *) &info.resp); 361 if (ret) { 362 devctx_err(dev_ctx, "%s: imx_s400_api_call failed for cmd [0x%x]\n", 363 __func__, info.cmd_id); 364 ret = -EIO; 365 } 366 367 ret = (int)copy_to_user((u8 *)arg, &info, 368 sizeof(info)); 369 if (ret) { 370 devctx_err(dev_ctx, "Failed to copy iobuff setup to user\n"); 371 ret = -EFAULT; 372 } 373 374 exit: 375 return ret; 376 } 377 static int s4_muap_ioctl_img_auth_cmd_handler(struct s4_mu_device_ctx *dev_ctx, 378 unsigned long arg) 379 { 380 struct imx_s400_api *s400_muap_priv = dev_ctx->s400_muap_priv; 381 struct s4_muap_auth_image s4_muap_auth_image; 382 struct container_hdr *phdr = &s4_muap_auth_image.chdr; 383 struct image_info *img = &s4_muap_auth_image.img_info[0]; 384 unsigned long base_addr = (unsigned long) &s4_muap_auth_image; 385 386 int i; 387 u16 length; 388 unsigned long s, e; 389 int ret = -EINVAL; 390 391 /* Check if not already configured. */ 392 if (dev_ctx->secure_mem.dma_addr != 0u) { 393 devctx_err(dev_ctx, "Shared memory not configured\n"); 394 goto exit; 395 } 396 397 ret = (int)copy_from_user(&s4_muap_auth_image, (u8 *)arg, 398 sizeof(s4_muap_auth_image)); 399 if (ret) { 400 devctx_err(dev_ctx, "Fail copy shared memory config to user\n"); 401 ret = -EFAULT; 402 goto exit; 403 } 404 405 406 if (!IS_ALIGNED(base_addr, 4)) { 407 devctx_err(dev_ctx, "Error: Image's address is not 4 byte aligned\n"); 408 return -EINVAL; 409 } 410 411 if (phdr->tag != 0x87 && phdr->version != 0x0) { 412 devctx_err(dev_ctx, "Error: Wrong container header\n"); 413 return -EFAULT; 414 } 415 416 if (!phdr->num_images) { 417 devctx_err(dev_ctx, "Error: Wrong container, no image found\n"); 418 return -EFAULT; 419 } 420 length = phdr->length_lsb + (phdr->length_msb << 8); 421 422 devctx_dbg(dev_ctx, "container length %u\n", length); 423 424 s400_muap_priv->tx_msg.header = (s400_muap_priv->cmd_tag << 24) | 425 (S400_OEM_CNTN_AUTH_REQ << 16) | 426 (S400_OEM_CNTN_AUTH_REQ_SIZE << 8) | 427 S400_VERSION; 428 s400_muap_priv->tx_msg.data[0] = ((u32)(((base_addr) >> 16) >> 16)); 429 s400_muap_priv->tx_msg.data[1] = ((u32)(base_addr)); 430 431 ret = imx_s400_api_call(s400_muap_priv, (void *) &s4_muap_auth_image.resp); 432 if (ret || (s4_muap_auth_image.resp != S400_SUCCESS_IND)) { 433 devctx_err(dev_ctx, "Error: Container Authentication failed.\n"); 434 ret = -EIO; 435 goto exit; 436 } 437 438 /* Copy images to dest address */ 439 for (i = 0; i < phdr->num_images; i++) { 440 img = img + i; 441 442 //devctx_dbg(dev_ctx, "img %d, dst 0x%x, src 0x%lux, size 0x%x\n", 443 // i, (u32) img->dst, 444 // (unsigned long)img->offset + phdr, img->size); 445 446 memcpy((void *)img->dst, (const void *)(img->offset + phdr), 447 img->size); 448 449 s = img->dst & ~(CACHELINE_SIZE - 1); 450 e = ALIGN(img->dst + img->size, CACHELINE_SIZE) - 1; 451 452 #ifdef CONFIG_ARM64 453 __flush_dcache_area((void *) s, e); 454 #else 456 #endif 457 s400_muap_priv->tx_msg.header = (s400_muap_priv->cmd_tag << 24) | 458 (S400_VERIFY_IMAGE_REQ << 16) | 459 (S400_VERIFY_IMAGE_REQ_SIZE << 8) | 460 S400_VERSION; 461 s400_muap_priv->tx_msg.data[0] = 1 << i; 462 ret = imx_s400_api_call(s400_muap_priv, (void *) &s4_muap_auth_image.resp); 463 if (ret || (s4_muap_auth_image.resp != S400_SUCCESS_IND)) { 464 devctx_err(dev_ctx, "Error: Image Verification failed.\n"); 465 ret = -EIO; 466 goto exit; 467 } 468 } 469 470 exit: 471 s400_muap_priv->tx_msg.header = (s400_muap_priv->cmd_tag << 24) | 472 (S400_RELEASE_CONTAINER_REQ << 16) | 473 (S400_RELEASE_CONTAINER_REQ_SIZE << 8) | 474 S400_VERSION; 475 ret = imx_s400_api_call(s400_muap_priv, (void *) &s4_muap_auth_image.resp); 476 if (ret || (s4_muap_auth_image.resp != S400_SUCCESS_IND)) { 477 devctx_err(dev_ctx, "Error: Release Container failed.\n"); 478 ret = -EIO; 479 } 480 481 ret = (int)copy_to_user((u8 *)arg, &s4_muap_auth_image, 482 sizeof(s4_muap_auth_image)); 483 if (ret) { 484 devctx_err(dev_ctx, "Failed to copy iobuff setup to user\n"); 485 ret = -EFAULT; 486 } 487 return ret; 488 } 489 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org