tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y head: c65356f0f7268b1260dd64415c2145e73640872e commit: 53a72858bcae7eaa7df8d167dbf60682d70f82a6 [384/946] m68knommu: only set CONFIG_ISA_DMA_API for ColdFire sub-arch config: m68k-buildonly-randconfig-r004-20211019 (attached as .config) compiler: m68k-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.4.y git checkout 53a72858bcae7eaa7df8d167dbf60682d70f82a6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/m68k/include/asm/bug.h:32, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/m68k/include/generated/asm/preempt.h:1, 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/stat.h:19, from include/linux/module.h:10, from drivers/staging/comedi/drivers/comedi_isadma.c:7: include/linux/dma-mapping.h: In function 'dma_map_resource': arch/m68k/include/asm/page_mm.h:169:50: warning: ordered comparison of pointer with null pointer [-Wextra] 169 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) | ^~ include/asm-generic/bug.h:182:32: note: in definition of macro 'WARN_ON' 182 | int __ret_warn_on = !!(condition); \ | ^~~~~~~~~ include/linux/dma-mapping.h:355:13: note: in expansion of macro 'WARN_ON_ONCE' 355 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr)))) | ^~~~~~~~~~~~ arch/m68k/include/asm/page_mm.h:170:33: note: in expansion of macro 'virt_addr_valid' 170 | #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) | ^~~~~~~~~~~~~~~ include/linux/dma-mapping.h:355:26: note: in expansion of macro 'pfn_valid' 355 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr)))) | ^~~~~~~~~ drivers/staging/comedi/drivers/comedi_isadma.c: In function 'comedi_isadma_program': 25 | flags = claim_dma_lock(); | ^~~~~~~~~~~~~~ 31 | release_dma_lock(flags); | ^~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/claim_dma_lock +25 drivers/staging/comedi/drivers/comedi_isadma.c 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 16 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 17 /** 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 18 * comedi_isadma_program - program and enable an ISA DMA transfer 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 19 * @desc: the ISA DMA cookie to program and enable 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 20 */ 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 21 void comedi_isadma_program(struct comedi_isadma_desc *desc) 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 22 { 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 23 unsigned long flags; 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 24 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 @25 flags = claim_dma_lock(); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 26 clear_dma_ff(desc->chan); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 27 set_dma_mode(desc->chan, desc->mode); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 28 set_dma_addr(desc->chan, desc->hw_addr); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 29 set_dma_count(desc->chan, desc->size); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 30 enable_dma(desc->chan); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 @31 release_dma_lock(flags); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 32 } 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 33 EXPORT_SYMBOL_GPL(comedi_isadma_program); 20a1ea7d6ba184 H Hartley Sweeten 2015-01-14 34 :::::: The code at line 25 was first introduced by commit :::::: 20a1ea7d6ba184a1f6e25e85786738003387cada staging: comedi: comedi_isadma: introduce helper module for ISA DMA :::::: TO: H Hartley Sweeten <hsweeten(a)visionengravers.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org