Hi Mihail, I love your patch! Perhaps something to improve: [auto build test WARNING on 94a853eca720ac9e385e59f27e859b4a01123f58] url: https://github.com/0day-ci/linux/commits/Mihail-Chindris/iio-Add-output-b... base: 94a853eca720ac9e385e59f27e859b4a01123f58 config: mips-randconfig-s031-20210821 (attached as .config) compiler: mipsel-linux-gcc (GCC) 11.2.0 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: v0.6.3-348-gf0e6938b-dirty # https://github.com/0day-ci/linux/commit/4ad051f1e5a488f51842037c42fa17b5a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mihail-Chindris/iio-Add-output-buffer-support-and-DAC-example/20210821-010349 git checkout 4ad051f1e5a488f51842037c42fa17b5a1ce1d38 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/buffer/ 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 >>) command-line: note: in included file: builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQUIRE redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_SEQ_CST redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQ_REL redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_RELEASE redefined builtin:0:0: sparse: this was the original definition vim +165 drivers/iio/buffer/kfifo_buf.c 152 153 static int iio_kfifo_remove_from(struct iio_buffer *r, void *data) 154 { 155 int ret; 156 struct iio_kfifo *kf = iio_to_kfifo(r); 157 158 if (kfifo_size(&kf->kf) < 1) 159 return -EBUSY; 160 161 ret = kfifo_out(&kf->kf, data, 1); 162 if (ret != 1) 163 return -EBUSY; 164 166 167 return 0; 168 } 169 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org