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-buffer-support-and-DAC-example/20210821-010349
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/4ad051f1e5a488f51842037c42fa17b5a1ce1d38
        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@intel.com>


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
>> drivers/iio/buffer/kfifo_buf.c:165:9: sparse: sparse: cast to restricted __poll_t

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	
 > 165		wake_up_interruptible_poll(&r->pollq, POLLOUT | POLLWRNORM);
   166	
   167		return 0;
   168	}
   169	

---
0-DAY CI Kernel Test Service, Intel Corporation
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