reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git/commit/?id=3f30db282c28cc35a502aa1cec34fb642854b057
        git remote add vkoul-dmaengine https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git
        git fetch --no-tags vkoul-dmaengine next
        git checkout 3f30db282c28cc35a502aa1cec34fb642854b057

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/dma/xilinx/ drivers/gpu/drm/amd/display/amdgpu_dm/