tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/4.9
head:   483e4c5d481661c50aceaf498358f089136cb478
commit: 47ce3ea488109f17f552b9af32100f48ff4a019b [18/19] wait_on_bit: add an acquire memory barrier
config: arc-defconfig
compiler: arc-elf-gcc (GCC) 7.5.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ammarfaizi2/linux-block/commit/47ce3ea488109f17f552b9af32100f48ff4a019b
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block stable/linux-stable-rc/queue/4.9
        git checkout 47ce3ea488109f17f552b9af32100f48ff4a019b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross W=1 O=build_dir ARCH=arc prepare

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/completion.h:11:0,
                    from include/linux/rcupdate.h:43,
                    from include/linux/rbtree.h:34,
                    from include/linux/sched.h:22,
                    from arch/arc/kernel/asm-offsets.c:9:
   include/linux/wait.h: In function 'wait_on_bit':
>> include/linux/wait.h:1069:7: error: implicit declaration of function 'test_bit_acquire'; did you mean 'test_bit_le'? [-Werror=implicit-function-declaration]
     if (!test_bit_acquire(bit, word))
          ^~~~~~~~~~~~~~~~
          test_bit_le
   cc1: some warnings being treated as errors
   make[2]: *** [./Kbuild:57: arch/arc/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1081: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:152: sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +1069 include/linux/wait.h

  1048	
  1049	/**
  1050	 * wait_on_bit - wait for a bit to be cleared
  1051	 * @word: the word being waited on, a kernel virtual address
  1052	 * @bit: the bit of the word being waited on
  1053	 * @mode: the task state to sleep in
  1054	 *
  1055	 * There is a standard hashed waitqueue table for generic use. This
  1056	 * is the part of the hashtable's accessor API that waits on a bit.
  1057	 * For instance, if one were to have waiters on a bitflag, one would
  1058	 * call wait_on_bit() in threads waiting for the bit to clear.
  1059	 * One uses wait_on_bit() where one is waiting for the bit to clear,
  1060	 * but has no intention of setting it.
  1061	 * Returned value will be zero if the bit was cleared, or non-zero
  1062	 * if the process received a signal and the mode permitted wakeup
  1063	 * on that signal.
  1064	 */
  1065	static inline int
  1066	wait_on_bit(unsigned long *word, int bit, unsigned mode)
  1067	{
  1068		might_sleep();
> 1069		if (!test_bit_acquire(bit, word))
  1070			return 0;
  1071		return out_of_line_wait_on_bit(word, bit,
  1072					       bit_wait,
  1073					       mode);
  1074	}
  1075	

-- 
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