Hi Kirill, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm/protected-memory head: d9455e6eabef4b9be5f33c418a8046e0389edade commit: dbd4c551b3d34cb3e06e575eb205e2056f4a6e76 [3/16] x86/kvm: Make DMA pages shared config: x86_64-randconfig-s021-20200916 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-201-g24bdaac6-dirty git checkout dbd4c551b3d34cb3e06e575eb205e2056f4a6e76 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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 >>): 16 | bool force_dma_unencrypted(struct device *dev) | ^~~~~~~~~~~~~~~~~~~~~ # https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/com... git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git git fetch --no-tags arm-platforms kvm/protected-memory git checkout dbd4c551b3d34cb3e06e575eb205e2056f4a6e76 vim +/force_dma_unencrypted +16 arch/x86/mm/mem_encrypt_common.c 0fdb85af352f8f Kirill A. Shutemov 2020-05-22 14 0fdb85af352f8f Kirill A. Shutemov 2020-05-22 15 /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ 0fdb85af352f8f Kirill A. Shutemov 2020-05-22 @16 bool force_dma_unencrypted(struct device *dev) :::::: The code at line 16 was first introduced by commit :::::: 0fdb85af352f8f003ce368eaeee57406f748801e x86/mm: Move force_dma_unencrypted() to common code :::::: TO: Kirill A. Shutemov <kirill(a)shutemov.name&gt; :::::: CC: Marc Zyngier <maz(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org