[kbuild-all] drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:451:5: warning: no previous prototype for function 'jpeg_v1_0_early_init'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 69119673bd50b176ded34032fadd41530fb5af21 commit: bb0db70f3f75e0d994a627f22c3ff2d8ec6191c4 drm/amdgpu: separate JPEG1.0 code out from VCN1.0 date: 7 months ago config: s390-randconfig-r004-20200617 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390-linux-gnu git checkout bb0db70f3f75e0d994a627f22c3ff2d8ec6191c4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 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 >>, old ones prefixed by <<): In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:33: In file included from include/drm/drm_crtc.h:31: In file included from include/linux/fb.h:17: In file included from arch/s390/include/asm/io.h:76: include/asm-generic/io.h:492:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:118:21: note: expanded from macro '__swab32' ___constant_swab32(x) : ^ include/uapi/linux/swab.h:19:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | ^ In file included from drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:24: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:57: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:33: In file included from include/drm/drm_crtc.h:31: In file included from include/linux/fb.h:17: In file included from arch/s390/include/asm/io.h:76: include/asm-generic/io.h:492:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:118:21: note: expanded from macro '__swab32' ___constant_swab32(x) : ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | ^ In file included from drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:24: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:57: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:33: In file included from include/drm/drm_crtc.h:31: In file included from include/linux/fb.h:17: In file included from arch/s390/include/asm/io.h:76: include/asm-generic/io.h:492:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:118:21: note: expanded from macro '__swab32' ___constant_swab32(x) : ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:24: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:57: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:33: In file included from include/drm/drm_crtc.h:31: In file included from include/linux/fb.h:17: In file included from arch/s390/include/asm/io.h:76: include/asm-generic/io.h:492:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:24: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:57: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:33: In file included from include/drm/drm_crtc.h:31: In file included from include/linux/fb.h:17: In file included from arch/s390/include/asm/io.h:76: include/asm-generic/io.h:503:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:513:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew(cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:523:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel(cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:585:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:593:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:601:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:610:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:619:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:628:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ int jpeg_v1_0_early_init(void *handle) ^ drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:451:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int jpeg_v1_0_early_init(void *handle) ^ static int jpeg_v1_0_sw_init(void *handle) ^ drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:469:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int jpeg_v1_0_sw_init(void *handle) ^ static void jpeg_v1_0_sw_fini(void *handle) ^ drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:499:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void jpeg_v1_0_sw_fini(void *handle) ^ static void jpeg_v1_0_start(struct amdgpu_device *adev, int mode) ^ drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c:513:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void jpeg_v1_0_start(struct amdgpu_device *adev, int mode) ^ static 24 warnings generated. vim +/jpeg_v1_0_early_init +451 drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c 443 444 /** 445 * jpeg_v1_0_early_init - set function pointers 446 * 447 * @handle: amdgpu_device pointer 448 * 449 * Set ring and irq function pointers 450 */ 452 { 453 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 454 455 adev->jpeg.num_jpeg_inst = 1; 456 457 jpeg_v1_0_set_dec_ring_funcs(adev); 458 jpeg_v1_0_set_irq_funcs(adev); 459 460 return 0; 461 } 462 463 /** 464 * jpeg_v1_0_sw_init - sw init for JPEG block 465 * 466 * @handle: amdgpu_device pointer 467 * 468 */ 470 { 471 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 472 struct amdgpu_ring *ring; 473 int r; 474 475 /* JPEG TRAP */ 476 r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_VCN, 126, &adev->jpeg.inst->irq); 477 if (r) 478 return r; 479 480 ring = &adev->jpeg.inst->ring_dec; 481 sprintf(ring->name, "jpeg_dec"); 482 r = amdgpu_ring_init(adev, ring, 512, &adev->jpeg.inst->irq, 0); 483 if (r) 484 return r; 485 486 adev->jpeg.internal.jpeg_pitch = adev->jpeg.inst->external.jpeg_pitch = 487 SOC15_REG_OFFSET(JPEG, 0, mmUVD_JPEG_PITCH); 488 489 return 0; 490 } 491 492 /** 493 * jpeg_v1_0_sw_fini - sw fini for JPEG block 494 * 495 * @handle: amdgpu_device pointer 496 * 497 * JPEG free up sw allocation 498 */ 500 { 501 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 502 503 amdgpu_ring_fini(&adev->jpeg.inst[0].ring_dec); 504 } 505 506 /** 507 * jpeg_v1_0_start - start JPEG block 508 * 509 * @adev: amdgpu_device pointer 510 * 511 * Setup and start the JPEG block 512 */ 514 { 515 struct amdgpu_ring *ring = &adev->jpeg.inst->ring_dec; 516 517 if (mode == 0) { 518 WREG32_SOC15(JPEG, 0, mmUVD_LMI_JRBC_RB_VMID, 0); 519 WREG32_SOC15(JPEG, 0, mmUVD_JRBC_RB_CNTL, UVD_JRBC_RB_CNTL__RB_NO_FETCH_MASK | 520 UVD_JRBC_RB_CNTL__RB_RPTR_WR_EN_MASK); 521 WREG32_SOC15(JPEG, 0, mmUVD_LMI_JRBC_RB_64BIT_BAR_LOW, lower_32_bits(ring->gpu_addr)); 522 WREG32_SOC15(JPEG, 0, mmUVD_LMI_JRBC_RB_64BIT_BAR_HIGH, upper_32_bits(ring->gpu_addr)); 523 WREG32_SOC15(JPEG, 0, mmUVD_JRBC_RB_RPTR, 0); 524 WREG32_SOC15(JPEG, 0, mmUVD_JRBC_RB_WPTR, 0); 525 } WREG32_SOC15(JPEG, 0, mmUVD_JRBC_RB_CNTL, UVD_JRBC_RB_CNTL__RB_RPTR_WR_EN_MASK); 526 527 /* initialize wptr */ 528 ring->wptr = RREG32_SOC15(JPEG, 0, mmUVD_JRBC_RB_WPTR); 529 530 /* copy patch commands to the jpeg ring */ 531 jpeg_v1_0_decode_ring_set_patch_ring(ring, 532 (ring->wptr + ring->max_dw * amdgpu_sched_hw_submission)); 533 } 534 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org