Hi Alexandru, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on linux/master linus/master v5.11-rc7 next-20210125] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Alexandru-Ardelean/iio-core-buff... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: h8300-randconfig-s031-20210209 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/9240fca112896274a76973066ca456b5b... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexandru-Ardelean/iio-core-buffer-add-support-for-multiple-IIO-buffers-per-IIO-device/20210210-182500 git checkout 9240fca112896274a76973066ca456b5b87eeb8c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/iio/industrialio-buffer.c:209:24: sparse: expected restricted __poll_t drivers/iio/industrialio-buffer.c:209:24: sparse: got int vim +209 drivers/iio/industrialio-buffer.c 200 201 __poll_t iio_buffer_poll_wrapper(struct file *filp, 202 struct poll_table_struct *wait) 203 { 204 struct iio_dev_buffer_pair *ib = filp->private_data; 205 struct iio_buffer *rb = ib->buffer; 206 207 /* check if buffer was opened through new API */ 208 if (test_bit(IIO_BUSY_BIT_POS, &rb->flags)) 210 211 return iio_buffer_poll(filp, wait); 212 } 213 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org