Re: [PATCH] HID: uhid: Fixes a bug with userspace bluetooth stacks, which causes hangs during certain operations

From: kbuild test robot
Date: Thu Apr 21 2016 - 17:16:31 EST


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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