Hi Rishabh, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on linux/master v5.6-rc7] [cannot apply to next-20200326] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Rishabh-Bhatnagar/Add-character-device-interface-to-remoteproc/20200327-062958 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9420e8ade4353a6710908ffafa23ecaf1caa0123 config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag Reported-by: kbuild test robot All errors (new ones prefixed by >>): >> drivers/remoteproc/remoteproc_userspace.c:31:12: error: conflicting types for 'rproc_release' 31 | static int rproc_release(struct inode *inode, struct file *file) | ^~~~~~~~~~~~~ In file included from drivers/remoteproc/remoteproc_userspace.c:14: drivers/remoteproc/remoteproc_internal.h:28:6: note: previous declaration of 'rproc_release' was here 28 | void rproc_release(struct kref *kref); | ^~~~~~~~~~~~~ vim +/rproc_release +31 drivers/remoteproc/remoteproc_userspace.c 30 > 31 static int rproc_release(struct inode *inode, struct file *file) 32 { 33 struct rproc *rproc; 34 35 rproc = container_of(inode->i_cdev, struct rproc, char_dev); 36 if (!rproc) 37 return -EINVAL; 38 39 rproc_shutdown(rproc); 40 41 return 0; 42 } 43 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org