Hi Baolin,

[auto build test ERROR on balbi-usb/next]
[also build test ERROR on v4.4-rc4 next-20151208]

url:    https://github.com/0day-ci/linux/commits/Baolin-Wang/gadget-Introduce-the-usb-charger-framework/20151208-163942
base:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next
config: m68k-allmodconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   ERROR: "usb_charger_init" [drivers/usb/gadget/udc/udc-core.ko] undefined!
   ERROR: "usb_charger_plug_by_gadget" [drivers/usb/gadget/udc/udc-core.ko] undefined!
   ERROR: "usb_charger_exit" [drivers/usb/gadget/udc/udc-core.ko] undefined!
   ERROR: "usb_charger_set_cur_limit_by_type" [drivers/usb/gadget/libcomposite.ko] undefined!
>> ERROR: "usb_charger_detect_type" [drivers/usb/gadget/libcomposite.ko] undefined!
   ERROR: "usb_charger_set_cur_limit_by_type" [drivers/usb/gadget/legacy/gadgetfs.ko] undefined!
>> ERROR: "usb_charger_detect_type" [drivers/usb/gadget/legacy/gadgetfs.ko] undefined!

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