tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   7e456521f271ddf5487e61004994f9ab8dac520d
commit: 1daa26c7ab0641f44fc949c251f4ff0f01640d9a [400/474] lib/test_user_copy.c: check __copy_in_user()/copy_in_user()
config: i386-randconfig-n1-201531 (attached as .config)
reproduce:
  git checkout 1daa26c7ab0641f44fc949c251f4ff0f01640d9a
  # save the attached .config to linux build tree
  make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   lib/test_user_copy.c: In function 'test_user_copy_init':
>> lib/test_user_copy.c:67:2: error: implicit declaration of function 'copy_in_user' [-Werror=implicit-function-declaration]
     ret |= test(copy_in_user(usermem, usermem + PAGE_SIZE, PAGE_SIZE),
     ^
>> lib/test_user_copy.c:84:2: error: implicit declaration of function '__copy_in_user' [-Werror=implicit-function-declaration]
     ret |= test(__copy_in_user(usermem, usermem + PAGE_SIZE, PAGE_SIZE),
     ^
   cc1: some warnings being treated as errors

vim +/copy_in_user +67 lib/test_user_copy.c

    61	
    62		/* Legitimate usage: none of these should fail. */
    63		ret |= test(copy_from_user(kmem, usermem, PAGE_SIZE),
    64			    "legitimate copy_from_user failed");
    65		ret |= test(copy_to_user(usermem, kmem, PAGE_SIZE),
    66			    "legitimate copy_to_user failed");
  > 67		ret |= test(copy_in_user(usermem, usermem + PAGE_SIZE, PAGE_SIZE),
    68			    "legitimate copy_in_user failed");
    69		ret |= test(get_user(value, (unsigned long __user *)usermem),
    70			    "legitimate get_user failed");
    71		ret |= test(put_user(value, (unsigned long __user *)usermem),
    72			    "legitimate put_user failed");
    73		ret |= test(clear_user(usermem, PAGE_SIZE) != 0,
    74			    "legitimate clear_user passed");
    75	
    76		ret |= test(!access_ok(VERIFY_READ, usermem, PAGE_SIZE * 2),
    77			    "legitimate access_ok VERIFY_READ failed");
    78		ret |= test(!access_ok(VERIFY_WRITE, usermem, PAGE_SIZE * 2),
    79			    "legitimate access_ok VERIFY_WRITE failed");
    80		ret |= test(__copy_from_user(kmem, usermem, PAGE_SIZE),
    81			    "legitimate __copy_from_user failed");
    82		ret |= test(__copy_to_user(usermem, kmem, PAGE_SIZE),
    83			    "legitimate __copy_to_user failed");
  > 84		ret |= test(__copy_in_user(usermem, usermem + PAGE_SIZE, PAGE_SIZE),
    85			    "legitimate __copy_in_user failed");
    86		ret |= test(__get_user(value, (unsigned long __user *)usermem),
    87			    "legitimate __get_user failed");

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