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

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-randconfig-002-20260818 (https://download.01.org/0day-ci/archive/20260819/[email protected]/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 844a18e753e822736c9805ab779144b647a2c186)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260819/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from kernel/locking/lockdep.c:84:
>> kernel/locking/lockdep_internals.h:248:16: error: use of undeclared identifier 'lock_classes'; did you mean 'nr_lock_classes'?
     248 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       nr_lock_classes
   kernel/locking/lockdep_internals.h:139:22: note: 'nr_lock_classes' declared here
     139 | extern unsigned long nr_lock_classes;
         |                      ^
>> kernel/locking/lockdep_internals.h:248:6: error: incompatible pointer to integer conversion assigning to 'int' from 'struct lock_class *' [-Wint-conversion]
     248 |         idx = class - lock_classes;
         |             ^ ~~~~~~~~~~~~~~~~~~~~
   kernel/locking/lockdep_internals.h:257:16: error: use of undeclared identifier 'lock_classes'; did you mean 'nr_lock_classes'?
     257 |         idx = class - lock_classes;
         |                       ^~~~~~~~~~~~
         |                       nr_lock_classes
   kernel/locking/lockdep_internals.h:139:22: note: 'nr_lock_classes' declared here
     139 | extern unsigned long nr_lock_classes;
         |                      ^
   kernel/locking/lockdep_internals.h:257:6: error: incompatible pointer to integer conversion assigning to 'int' from 'struct lock_class *' [-Wint-conversion]
     257 |         idx = class - lock_classes;
         |             ^ ~~~~~~~~~~~~~~~~~~~~
   4 errors generated.


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 <[email protected]>
:::::: CC: Ingo Molnar <[email protected]>

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