Hi Srivatsa, Thank you for the patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on xen-tip/linux-next linus/master v5.7-rc3 next-20200429] [cannot apply to swiotlb/linux-next] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Srivatsa-Vaddagiri/virtio-on-Type-1-hypervisor/20200429-032334 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: i386-randconfig-b002-20200429 (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/i915/i915_scatterlist.h:12:0, from drivers/gpu/drm/i915/i915_scatterlist.c:7: include/linux/swiotlb.h: In function 'swiotlb_alloc': >> include/linux/swiotlb.h:231:9: error: 'DMA_MAPPING_ERROR' undeclared (first use in this function); did you mean 'APM_NO_ERROR'? return DMA_MAPPING_ERROR; ^~~~~~~~~~~~~~~~~ APM_NO_ERROR include/linux/swiotlb.h:231:9: note: each undeclared identifier is reported only once for each function it appears in vim +231 include/linux/swiotlb.h 226 227 static inline phys_addr_t swiotlb_alloc(struct swiotlb_pool *pool, 228 size_t alloc_size, unsigned long tbl_dma_addr, 229 unsigned long mask) 230 { > 231 return DMA_MAPPING_ERROR; 232 } 233 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org