Hi Lee,

I love your patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on balbi-usb/testing/next char-misc/char-misc-testing v5.8-rc3 next-20200702]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Lee-Jones/Fix-a-bunch-of-W-1-issues-in-USB/20200702-225210
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 003a086ffc0d1affbb8300b36225fb8150a2d40a)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/mtu3/mtu3_trace.c:11:
>> drivers/usb/mtu3/mtu3_debug.h:29:36: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb);
                                      ^
   drivers/usb/mtu3/mtu3_debug.h:30:35: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb);
                                     ^
   drivers/usb/mtu3/mtu3_debug.h:31:39: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb);
                                         ^
   drivers/usb/mtu3/mtu3_debug.h:32:39: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb);
                                         ^
   In file included from drivers/usb/mtu3/mtu3_trace.c:12:
   In file included from drivers/usb/mtu3/mtu3_trace.h:279:
   include/trace/define_trace.h:95:10: fatal error: './mtu3_trace.h' file not found
   #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/trace/define_trace.h:90:32: note: expanded from macro 'TRACE_INCLUDE'
   # define TRACE_INCLUDE(system) __TRACE_INCLUDE(system)
                                  ^~~~~~~~~~~~~~~~~~~~~~~
   include/trace/define_trace.h:87:34: note: expanded from macro '__TRACE_INCLUDE'
   # define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h)
                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/stringify.h:10:27: note: expanded from macro '__stringify'
   #define __stringify(x...)       __stringify_1(x)
                                   ^~~~~~~~~~~~~~~~
   include/linux/stringify.h:9:29: note: expanded from macro '__stringify_1'
   #define __stringify_1(x...)     #x
                                   ^~
   <scratch space>:48:1: note: expanded from here
   "./mtu3_trace.h"
   ^~~~~~~~~~~~~~~~
   4 warnings and 1 error generated.
--
   In file included from drivers/usb/mtu3/mtu3_trace.c:11:
>> drivers/usb/mtu3/mtu3_debug.h:29:36: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb);
                                      ^
   drivers/usb/mtu3/mtu3_debug.h:30:35: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb);
                                     ^
   drivers/usb/mtu3/mtu3_debug.h:31:39: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb);
                                         ^
   drivers/usb/mtu3/mtu3_debug.h:32:39: warning: declaration of 'struct ssusb_mtk' will not be visible outside of this function [-Wvisibility]
   void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb);
                                         ^
   4 warnings generated.

vim +29 drivers/usb/mtu3/mtu3_debug.h

ae07809255d3e3 Chunfeng Yun 2019-03-21  27  
ae07809255d3e3 Chunfeng Yun 2019-03-21  28  #if IS_ENABLED(CONFIG_DEBUG_FS)
ae07809255d3e3 Chunfeng Yun 2019-03-21 @29  void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb);
4aab6ad24a101b Chunfeng Yun 2019-03-21  30  void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb);
ae07809255d3e3 Chunfeng Yun 2019-03-21  31  void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb);
ae07809255d3e3 Chunfeng Yun 2019-03-21  32  void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb);
ae07809255d3e3 Chunfeng Yun 2019-03-21  33  

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0-DAY CI Kernel Test Service, Intel Corporation
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