Hi Jonathan, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on net/master] [also build test WARNING on linus/master v5.8-rc1 next-20200618] [cannot apply to char-misc/char-misc-testing net-next/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jonathan-Lemon/netgpu-networking... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git ef7232da6bcd4294cbb2d424bc35885721570f01 config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce (this is a W=1 build): # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>, old ones prefixed by <<): In file included from arch/x86/include/asm/bug.h:86, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/efi.h:17, from drivers/firmware/efi/libstub/x86-stub.c:9: include/linux/dma-mapping.h: In function 'dma_map_resource': 352 | if (WARN_ON_ONCE(pfn_online(PHYS_PFN(phys_addr)))) | ^~~~~~~~~~ include/asm-generic/bug.h:101:25: note: in definition of macro 'WARN_ON_ONCE' 101 | int __ret_warn_on = !!(condition); | ^~~~~~~~~ vim +352 include/linux/dma-mapping.h 339 340 static inline dma_addr_t dma_map_resource(struct device *dev, 341 phys_addr_t phys_addr, 342 size_t size, 343 enum dma_data_direction dir, 344 unsigned long attrs) 345 { 346 const struct dma_map_ops *ops = get_dma_ops(dev); 347 dma_addr_t addr = DMA_MAPPING_ERROR; 348 349 BUG_ON(!valid_dma_direction(dir)); 350 351 /* Don't allow online RAM to be mapped */ 353 return DMA_MAPPING_ERROR; 354 355 if (dma_is_direct(ops)) 356 addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs); 357 else if (ops->map_resource) 358 addr = ops->map_resource(dev, phys_addr, size, dir, attrs); 359 360 debug_dma_map_resource(dev, phys_addr, size, dir, addr); 361 return addr; 362 } 363 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org