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

[kbuild test robot]

Hi,

[auto build test WARNING on hid/for-next]
[also build test WARNING 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-x003-201616 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/atomic.h:4:0,
                    from include/linux/atomic.h:4,
                    from drivers/hid/uhid.c:13:
   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()) {
         ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> drivers/hid/uhid.c:403:2: note: in expansion of macro 'if'
     if (is_compat_task()) {
     ^
   cc1: some warnings being treated as errors

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

   387		__u8 phys[64];
   388		__u8 uniq[64];
   389	
   390		compat_uptr_t rd_data;
   391		__u16 rd_size;
   392	
   393		__u16 bus;
   394		__u32 vendor;
   395		__u32 product;
   396		__u32 version;
   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))
   407				return -EFAULT;
   408	
   409			if (type == UHID_CREATE) {
   410				/*
   411				 * This is our messed up request with compat pointer.

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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