Hi Manivannan, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.15-rc6 next-20211019] [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/Manivannan-Sadhasivam/bus-mhi-Ad... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 519d81956ee277b4419c723adfb154603c2565ba config: hexagon-randconfig-r041-20211019 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b37efed957ed0a0193d80020aefd55cb587dfc1f) 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://github.com/0day-ci/linux/commit/434ab9e12f5e85c6d84c1a0524d850559... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Manivannan-Sadhasivam/bus-mhi-Add-mhi_prepare_for_transfer_autoqueue-API-for-DL-auto-queue/20211019-221447 git checkout 434ab9e12f5e85c6d84c1a0524d850559b058291 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): int __mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags) ^ drivers/bus/mhi/core/main.c:1615:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags) ^ static 1 warning generated. vim +/__mhi_prepare_for_transfer +1615 drivers/bus/mhi/core/main.c 1614 1616 { 1617 int ret, dir; 1618 struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; 1619 struct mhi_chan *mhi_chan; 1620 1621 for (dir = 0; dir < 2; dir++) { 1622 mhi_chan = dir ? mhi_dev->dl_chan : mhi_dev->ul_chan; 1623 if (!mhi_chan) 1624 continue; 1625 1626 ret = mhi_prepare_channel(mhi_cntrl, mhi_chan, flags); 1627 if (ret) 1628 goto error_open_chan; 1629 } 1630 1631 return 0; 1632 1633 error_open_chan: 1634 for (--dir; dir >= 0; dir--) { 1635 mhi_chan = dir ? mhi_dev->dl_chan : mhi_dev->ul_chan; 1636 if (!mhi_chan) 1637 continue; 1638 1639 mhi_unprepare_channel(mhi_cntrl, mhi_chan); 1640 } 1641 1642 return ret; 1643 } 1644 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org