[jimc:folio-pool-v2-lockdep 16/21] kernel/locking/lockdep_internals.h:248:23: error: 'lock_classes' undeclared; did you mean 'lock_class'?

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

tree:   https://github.com/jimc/linux.git folio-pool-v2-lockdep
head:   e77ee8289ea0755b0ee299348504d4568f942d71
commit: 9e99b37a40c36adbf813b758582f9b57aa5e41e3 [16/21] locking/lockdep: Migrate lock_classes array to 2-level dynamic folio chunks
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20260818/202608181124.s7vzTnUs-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260818/202608181124.s7vzTnUs-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608181124.s7vzTnUs-lkp@intel.com/

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

   In file included from kernel/locking/lockdep.c:84:
   kernel/locking/lockdep_internals.h: In function 'debug_class_ops_inc':
>> kernel/locking/lockdep_internals.h:248:23: error: 'lock_classes' undeclared (first use in this function); did you mean 'lock_class'?
     248 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       lock_class
   kernel/locking/lockdep_internals.h:248:23: note: each undeclared identifier is reported only once for each function it appears in
   kernel/locking/lockdep_internals.h: In function 'debug_class_ops_read':
   kernel/locking/lockdep_internals.h:257:23: error: 'lock_classes' undeclared (first use in this function); did you mean 'lock_class'?
     257 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       lock_class
   kernel/locking/lockdep.c: At top level:
>> kernel/locking/lockdep.c:1188:13: warning: 'in_any_zapped_class_list' defined but not used [-Wunused-function]
    1188 | static bool in_any_zapped_class_list(struct lock_class *class)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
--
   In file included from kernel/locking/lockdep_proc.c:25:
   kernel/locking/lockdep_internals.h: In function 'debug_class_ops_inc':
>> kernel/locking/lockdep_internals.h:248:23: error: 'lock_classes' undeclared (first use in this function); did you mean 'lock_class'?
     248 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       lock_class
   kernel/locking/lockdep_internals.h:248:23: note: each undeclared identifier is reported only once for each function it appears in
   kernel/locking/lockdep_internals.h: In function 'debug_class_ops_read':
   kernel/locking/lockdep_internals.h:257:23: error: 'lock_classes' undeclared (first use in this function); did you mean 'lock_class'?
     257 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       lock_class


vim +248 kernel/locking/lockdep_internals.h

8ca2b56cd7da98 Waiman Long 2018-10-03  243  
8ca2b56cd7da98 Waiman Long 2018-10-03  244  static inline void debug_class_ops_inc(struct lock_class *class)
8ca2b56cd7da98 Waiman Long 2018-10-03  245  {
8ca2b56cd7da98 Waiman Long 2018-10-03  246  	int idx;
8ca2b56cd7da98 Waiman Long 2018-10-03  247  
8ca2b56cd7da98 Waiman Long 2018-10-03 @248  	idx = class - lock_classes;
8ca2b56cd7da98 Waiman Long 2018-10-03  249  	__debug_atomic_inc(lock_class_ops[idx]);
8ca2b56cd7da98 Waiman Long 2018-10-03  250  }
8ca2b56cd7da98 Waiman Long 2018-10-03  251  

:::::: The code at line 248 was first introduced by commit
:::::: 8ca2b56cd7da98fc8f8d787bb706b9d6c8674a3b locking/lockdep: Make class->ops a percpu counter and move it under CONFIG_DEBUG_LOCKDEP=y

:::::: TO: Waiman Long <longman@redhat.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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