Re: [PATCH 1/2] lockdep: lock_set_cmp_fn()

[kernel test robot <lkp@intel.com>]

Hi Kent,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/locking/core]
[cannot apply to linus/master v6.4-rc1 next-20230509]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kent-Overstreet/bcache-Convert-to-lock_cmp_fn/20230510-040030
base:   tip/locking/core
patch link:    https://lore.kernel.org/r/20230509195847.1745548-1-kent.overstreet%40linux.dev
patch subject: [PATCH 1/2] lockdep: lock_set_cmp_fn()
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20230510/202305100552.41Mi8Ctu-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/f265373c48cadb6f81e032df9893abffc370ab89
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kent-Overstreet/bcache-Convert-to-lock_cmp_fn/20230510-040030
        git checkout f265373c48cadb6f81e032df9893abffc370ab89
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/md/bcache/ kernel/locking/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305100552.41Mi8Ctu-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/locking/lockdep.c: In function 'print_chain_keys_chain':
   kernel/locking/lockdep.c:3592:46: error: passing argument 1 of 'print_lock_name' from incompatible pointer type [-Werror=incompatible-pointer-types]
    3592 |                 print_lock_name(lock_classes + chain_hlock_class_idx(hlock_id));
         |                                 ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                                              |
         |                                              struct lock_class *
   kernel/locking/lockdep.c:732:47: note: expected 'struct held_lock *' but argument is of type 'struct lock_class *'
     732 | static void print_lock_name(struct held_lock *hlock, struct lock_class *class)
         |                             ~~~~~~~~~~~~~~~~~~^~~~~
   kernel/locking/lockdep.c:3592:17: error: too few arguments to function 'print_lock_name'
    3592 |                 print_lock_name(lock_classes + chain_hlock_class_idx(hlock_id));
         |                 ^~~~~~~~~~~~~~~
   kernel/locking/lockdep.c:732:13: note: declared here
     732 | static void print_lock_name(struct held_lock *hlock, struct lock_class *class)
         |             ^~~~~~~~~~~~~~~
   kernel/locking/lockdep.c: At top level:
>> kernel/locking/lockdep.c:4898:6: warning: no previous prototype for 'lockdep_set_lock_cmp_fn' [-Wmissing-prototypes]
    4898 | void lockdep_set_lock_cmp_fn(struct lockdep_map *lock, lock_cmp_fn cmp_fn,
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/lockdep_set_lock_cmp_fn +4898 kernel/locking/lockdep.c

  4896	
  4897	#ifdef CONFIG_PROVE_LOCKING
> 4898	void lockdep_set_lock_cmp_fn(struct lockdep_map *lock, lock_cmp_fn cmp_fn,
  4899				     lock_print_fn print_fn)
  4900	{
  4901		struct lock_class *class = lock->class_cache[0];
  4902		unsigned long flags;
  4903	
  4904		raw_local_irq_save(flags);
  4905		lockdep_recursion_inc();
  4906	
  4907		if (!class)
  4908			class = register_lock_class(lock, 0, 0);
  4909	
  4910		if (class) {
  4911			WARN_ON(class->cmp_fn	&& class->cmp_fn != cmp_fn);
  4912			WARN_ON(class->print_fn && class->print_fn != print_fn);
  4913	
  4914			class->cmp_fn	= cmp_fn;
  4915			class->print_fn = print_fn;
  4916		}
  4917	
  4918		lockdep_recursion_finish();
  4919		raw_local_irq_restore(flags);
  4920	}
  4921	EXPORT_SYMBOL_GPL(lockdep_set_lock_cmp_fn);
  4922	#endif
  4923	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests