Hi, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7f155c702677d057d03b192ce652311de5434697 commit: e1c7e324539ada3b2b13ca2898bcb4948a9ef9db dma-mapping: always provide the dma_map_ops based implementation date: 6 months ago config: m32r-allyesconfig (attached as .config) compiler: m32r-linux-gcc (GCC) 4.9.0 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout e1c7e324539ada3b2b13ca2898bcb4948a9ef9db # save the attached .config to linux build tree make.cross ARCH=m32r All errors (new ones prefixed by >>): drivers/media/v4l2-core/videobuf2-dma-contig.c: In function 'vb2_dc_get_userptr': >> drivers/media/v4l2-core/videobuf2-dma-contig.c:484:2: error: implicit declaration of function 'dma_get_cache_alignment' [-Werror=implicit-function-declaration] unsigned long dma_align = dma_get_cache_alignment(); ^ cc1: some warnings being treated as errors vim +/dma_get_cache_alignment +484 drivers/media/v4l2-core/videobuf2-dma-contig.c fb639eb3 Jan Kara 2015-07-13 478 struct frame_vector *vec; e15dab75 Tomasz Stanislawski 2012-06-14 479 unsigned long offset; fb639eb3 Jan Kara 2015-07-13 480 int n_pages, i; e15dab75 Tomasz Stanislawski 2012-06-14 481 int ret = 0; e15dab75 Tomasz Stanislawski 2012-06-14 482 struct sg_table *sgt; e15dab75 Tomasz Stanislawski 2012-06-14 483 unsigned long contig_size; d81e870d Marek Szyprowski 2012-06-12 @484 unsigned long dma_align = dma_get_cache_alignment(); 251a79f8 Hans Verkuil 2014-11-18 485 DEFINE_DMA_ATTRS(attrs); 251a79f8 Hans Verkuil 2014-11-18 486 251a79f8 Hans Verkuil 2014-11-18 487 dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); :::::: The code at line 484 was first introduced by commit :::::: d81e870d5afa1b0a95ea94c4052d3c7e973fae8c [media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned :::::: TO: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> :::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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