tree: https://github.com/ribalda/linux uvc-noncontiguous head: 08aff4b45dd51b3dfba18af4aa40b0fa5e2b5529 commit: 08aff4b45dd51b3dfba18af4aa40b0fa5e2b5529 [5/5] WIP media: uvc: Use dma_alloc_noncontiguos API config: powerpc64-randconfig-r011-20201118 (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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/ribalda/linux/commit/08aff4b45dd51b3dfba18af4aa40b0fa5... git remote add ribalda https://github.com/ribalda/linux git fetch --no-tags ribalda uvc-noncontiguous git checkout 08aff4b45dd51b3dfba18af4aa40b0fa5e2b5529 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 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 >>): drivers/media/usb/uvc/uvc_video.c:910:8: warning: no previous prototype for function 'uvc_video_dump_time_stats' [-Wmissing-prototypes] size_t uvc_video_dump_time_stats(char *buf, size_t size, ^ drivers/media/usb/uvc/uvc_video.c:910:1: note: declare 'static' if the function is not intended to be used outside of this translation unit size_t uvc_video_dump_time_stats(char *buf, size_t size, ^ static drivers/media/usb/uvc/uvc_video.c:931:8: warning: no previous prototype for function 'uvc_video_dump_speed' [-Wmissing-prototypes] size_t uvc_video_dump_speed(char *buf, size_t size, const char *pfx, u64 bytes, ^ drivers/media/usb/uvc/uvc_video.c:931:1: note: declare 'static' if the function is not intended to be used outside of this translation unit size_t uvc_video_dump_speed(char *buf, size_t size, const char *pfx, u64 bytes, ^ static drivers/media/usb/uvc/uvc_video.c:1738:4: error: implicit declaration of function 'dma_free_noncontiguous' [-Werror,-Wimplicit-function-declaration] dma_free_noncontiguous(stream_to_dmadev(stream), ^ drivers/media/usb/uvc/uvc_video.c:1757:7: error: implicit declaration of function 'dma_can_alloc_noncontiguous' [-Werror,-Wimplicit-function-declaration] if (!dma_can_alloc_noncontiguous(dma_dev)) { ^ drivers/media/usb/uvc/uvc_video.c:1763:19: error: implicit declaration of function 'dma_alloc_noncontiguous' [-Werror,-Wimplicit-function-declaration] uvc_urb->pages = dma_alloc_noncontiguous(dma_dev, stream->urb_size, ^ drivers/media/usb/uvc/uvc_video.c:1763:19: note: did you mean 'dma_can_alloc_noncontiguous'? drivers/media/usb/uvc/uvc_video.c:1757:7: note: 'dma_can_alloc_noncontiguous' declared here if (!dma_can_alloc_noncontiguous(dma_dev)) { ^ uvc_urb->pages = dma_alloc_noncontiguous(dma_dev, stream->urb_size, ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/usb/uvc/uvc_video.c:1771:3: error: implicit declaration of function 'dma_free_noncontiguous' [-Werror,-Wimplicit-function-declaration] dma_free_noncontiguous(dma_dev, stream->urb_size, uvc_urb->pages, uvc_urb->dma); ^ 3 warnings and 4 errors generated. vim +1763 drivers/media/usb/uvc/uvc_video.c 1751 1752 static bool uvc_alloc_urb_buffer(struct uvc_streaming *stream, struct uvc_urb *uvc_urb, 1753 gfp_t gfp_flags) 1754 { 1755 struct device *dma_dev = stream_to_dmadev(stream); 1756 1757 if (!dma_can_alloc_noncontiguous(dma_dev)) { 1758 uvc_urb->buffer = usb_alloc_coherent(stream->dev->udev, stream->urb_size, 1759 gfp_flags | __GFP_NOWARN, &uvc_urb->dma); 1760 return uvc_urb->buffer != NULL; 1761 } 1762 1764 &uvc_urb->dma, gfp_flags | __GFP_NOWARN, 0); 1765 if (!uvc_urb->pages) 1766 return false; 1767 1768 uvc_urb->buffer = vmap(uvc_urb->pages, PAGE_ALIGN(stream->urb_size) >> PAGE_SHIFT, 1769 VM_DMA_COHERENT, PAGE_KERNEL); 1770 if (!uvc_urb->buffer) { 1771 dma_free_noncontiguous(dma_dev, stream->urb_size, uvc_urb->pages, uvc_urb->dma); 1772 return false; 1773 } 1774 1775 return true; 1776 } 1777 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org