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

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

Hi Kent,

kernel test robot noticed the following build errors:

[auto build test ERROR 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/20230510/202305100719.eq9Z9e7H-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/ kernel/

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/202305100719.eq9Z9e7H-lkp@intel.com/

All errors (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 +/print_lock_name +3592 kernel/locking/lockdep.c

39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3580  
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3581  static void print_chain_keys_chain(struct lock_chain *chain)
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3582  {
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3583  	int i;
f6ec8829ac9d59 Yuyang Du                 2019-05-06  3584  	u64 chain_key = INITIAL_CHAIN_KEY;
f611e8cf98ec90 Boqun Feng                2020-08-07  3585  	u16 hlock_id;
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3586  
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3587  	printk("depth: %u\n", chain->depth);
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3588  	for (i = 0; i < chain->depth; i++) {
f611e8cf98ec90 Boqun Feng                2020-08-07  3589  		hlock_id = chain_hlocks[chain->base + i];
f611e8cf98ec90 Boqun Feng                2020-08-07  3590  		chain_key = print_chain_key_iteration(hlock_id, chain_key);
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3591  
28df029d53a2fd Cheng Jui Wang            2022-02-10 @3592  		print_lock_name(lock_classes + chain_hlock_class_idx(hlock_id));
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3593  		printk("\n");
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3594  	}
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3595  }
39e2e173fb1f90 Alfredo Alvarez Fernandez 2016-03-30  3596  

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