Hi,

[auto build test ERROR on hid/for-next]
[also build test ERROR on v4.6-rc4 next-20160421]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/roderick-gaikai-com/HID-uhid-Fixes-a-bug-with-userspace-bluetooth-stacks-which-causes-hangs-during-certain-operations/20160422-050505
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid.git for-next
config: x86_64-randconfig-x010-201616 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/hid/uhid.c: In function 'uhid_event_from_user':
>> drivers/hid/uhid.c:403:6: error: implicit declaration of function 'is_compat_task' [-Werror=implicit-function-declaration]
     if (is_compat_task()) {
         ^
   cc1: some warnings being treated as errors

vim +/is_compat_task +403 drivers/hid/uhid.c

   397		__u32 country;
   398	} __attribute__((__packed__));
   399	
   400	static int uhid_event_from_user(const char __user *buffer, size_t len,
   401					struct uhid_event *event)
   402	{
 > 403		if (is_compat_task()) {
   404			u32 type;
   405	
   406			if (get_user(type, buffer))

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