Hi Greg, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing head: 71d3edc61e29e45b613b841108688d711846f969 commit: 8ffdff6a8cfbdc174a3a390b6f825a277b5bb895 [704/705] staging: comedi: move out of staging directory config: m68k-randconfig-r006-20210415 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 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/gregkh/staging.git/commit... git remote add staging https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git git fetch --no-tags staging staging-testing git checkout 8ffdff6a8cfbdc174a3a390b6f825a277b5bb895 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 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 >>): drivers/comedi/drivers/comedi_isadma.c: In function 'comedi_isadma_program': 25 | flags = claim_dma_lock(); | ^~~~~~~~~~~~~~ 31 | release_dma_lock(flags); | ^~~~~~~~~~~~~~~~ | release_task cc1: some warnings being treated as errors vim +/claim_dma_lock +25 drivers/comedi/drivers/comedi_isadma.c 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 16 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 17 /** 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 18 * comedi_isadma_program - program and enable an ISA DMA transfer 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 19 * @desc: the ISA DMA cookie to program and enable 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 20 */ 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 21 void comedi_isadma_program(struct comedi_isadma_desc *desc) 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 22 { 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 23 unsigned long flags; 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 24 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 @25 flags = claim_dma_lock(); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 26 clear_dma_ff(desc->chan); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 27 set_dma_mode(desc->chan, desc->mode); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 28 set_dma_addr(desc->chan, desc->hw_addr); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 29 set_dma_count(desc->chan, desc->size); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 30 enable_dma(desc->chan); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 @31 release_dma_lock(flags); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 32 } 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c H Hartley Sweeten 2015-01-14 33 EXPORT_SYMBOL_GPL(comedi_isadma_program); 20a1ea7d6ba184 drivers/staging/comedi/drivers/comedi_isadma.c 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