Hi Okajima,

[auto build test ERROR on tip/locking/core]
[also build test ERROR on v4.10-rc6 next-20170202]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/J-R-Okajima/lockdep-consolidate-by-new-find_held_lock/20170203-010303
config: x86_64-randconfig-x018-201705 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel/locking/rwsem.c: In function 'downgrade_write':
>> kernel/locking/rwsem.c:126:2: error: implicit declaration of function 'lock_downgrade' [-Werror=implicit-function-declaration]
     lock_downgrade(&sem->dep_map, _RET_IP_);
     ^~~~~~~~~~~~~~
>> kernel/locking/rwsem.c:126:21: error: 'struct rw_semaphore' has no member named 'dep_map'
     lock_downgrade(&sem->dep_map, _RET_IP_);
                        ^~
   cc1: some warnings being treated as errors

vim +/lock_downgrade +126 kernel/locking/rwsem.c

   120	
   121	/*
   122	 * downgrade write lock to read lock
   123	 */
   124	void downgrade_write(struct rw_semaphore *sem)
   125	{
 > 126		lock_downgrade(&sem->dep_map, _RET_IP_);
   127	
   128		rwsem_set_reader_owned(sem);
   129		__downgrade_write(sem);

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