[PATCH 2/2] usb: gadget: functionfs: Add DMABUF import interface

[kernel test robot]

Hi Paul,

I love your patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.3-rc2 next-20230314]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Paul-Cercueil/usb-gadget-Support-already-mapped-DMA-SGs/20230314-185522
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20230314105257.17345-3-paul%40crapouillou.net
patch subject: [PATCH 2/2] usb: gadget: functionfs: Add DMABUF import interface
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230314/202303142140.ZQsw4C4V-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/4ee364ed5d112c4550344fd037f4e1ef7cc41878
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Paul-Cercueil/usb-gadget-Support-already-mapped-DMA-SGs/20230314-185522
        git checkout 4ee364ed5d112c4550344fd037f4e1ef7cc41878
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/usb/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303142140.ZQsw4C4V-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/usb/gadget/function/f_fs.c:1401:5: warning: no previous prototype for 'ffs_dma_resv_lock' [-Wmissing-prototypes]
    1401 | int ffs_dma_resv_lock(struct dma_buf *dmabuf, bool nonblock)
         |     ^~~~~~~~~~~~~~~~~


vim +/ffs_dma_resv_lock +1401 drivers/usb/gadget/function/f_fs.c

  1400	
> 1401	int ffs_dma_resv_lock(struct dma_buf *dmabuf, bool nonblock)
  1402	{
  1403		int ret;
  1404	
  1405		ret = dma_resv_lock_interruptible(dmabuf->resv, NULL);
  1406		if (ret) {
  1407			if (ret != -EDEADLK)
  1408				goto out;
  1409			if (nonblock) {
  1410				ret = -EBUSY;
  1411				goto out;
  1412			}
  1413	
  1414			ret = dma_resv_lock_slow_interruptible(dmabuf->resv, NULL);
  1415		}
  1416	
  1417	out:
  1418		return ret;
  1419	}
  1420	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests