tree: https://github.com/thierryreding/linux for-5.6/nouveau head: 3a536588f14e8684b2d6b6257dfa1d8f6f88becd commit: f465e8eba396ce6a62067718135cc29644029964 [117/138] dma-buf: Remove kernel map/unmap hooks config: arm-allmodconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f465e8eba396ce6a62067718135cc29644029964 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=arm If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): .map = kmap_udmabuf, ^~~ mmap .map = kmap_udmabuf, ^~~~~~~~~~~~ drivers/dma-buf/udmabuf.c:114:12: note: (near initialization for 'udmabuf_ops.begin_cpu_access') .unmap = kunmap_udmabuf, ^~~~~ vunmap drivers/dma-buf/udmabuf.c:115:14: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] .unmap = kunmap_udmabuf, ^~~~~~~~~~~~~~ drivers/dma-buf/udmabuf.c:115:14: note: (near initialization for 'udmabuf_ops.end_cpu_access') cc1: some warnings being treated as errors vim +114 drivers/dma-buf/udmabuf.c fbb0de79507819 Gerd Hoffmann 2018-08-27 109 a34852891ba45d Gerd Hoffmann 2018-09-11 110 static const struct dma_buf_ops udmabuf_ops = { fbb0de79507819 Gerd Hoffmann 2018-08-27 111 .map_dma_buf = map_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 112 .unmap_dma_buf = unmap_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 113 .release = release_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 @114 .map = kmap_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 @115 .unmap = kunmap_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 116 .mmap = mmap_udmabuf, fbb0de79507819 Gerd Hoffmann 2018-08-27 117 }; fbb0de79507819 Gerd Hoffmann 2018-08-27 118 :::::: The code at line 114 was first introduced by commit :::::: fbb0de795078190a9834b3409e4b009cfb18a6d4 Add udmabuf misc device :::::: TO: Gerd Hoffmann <kraxel(a)redhat.com&gt; :::::: CC: Gerd Hoffmann <kraxel(a)redhat.com&gt; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation