[kbuild-all] Re: [PATCH 09/12] dma-direct: remove __dma_to_phys

Hi Christoph, url: https://github.com/0day-ci/linux/commits/Christoph-Hellwig/MIPS-make-dma_... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: x86_64-randconfig-m001-20200909 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/xen/swiotlb-xen.c:315 xen_swiotlb_alloc_coherent() error: we previously assumed 'hwdev' could be null (see line 308)