kernel/locking/lockdep.c: convert hash tables to hlists

Hello Andrew Morton,

The patch 680a50c9271b: "kernel/locking/lockdep.c: convert hash tables to hlists" from Feb 4, 2016, leads to the following static checker warning:

kernel/locking/lockdep.c:3933 lockdep_free_key_range()
warn: 'head' can't be NULL.

kernel/locking/lockdep.c
3928 /*
3929 * Unhash all classes that were created by this module:
3930 */
3931 for (i = 0; i < CLASSHASH_SIZE; i++) {
3932 head = classhash_table + i;
3933 if (!head)

classhash_table is an array.

  3934                          continue;
  3935                  hlist_for_each_entry_rcu(class, head, hash_entry) {
  3936                          if (within(class->key, start, size))
  3937                                  zap_class(class);
  3938                          else if (within(class->name, start, size))
  3939                                  zap_class(class);
  3940                  }
  3941          }

Also:
kernel/locking/lockdep.c:3990 lockdep_reset_lock() warn: 'head' can't be NULL.

regards,
dan carpenter

doh, OK, thanks, even better.

@@ -3930,8 +3930,6 @@ void lockdep_free_key_range(void *start,
 	 */
 	for (i = 0; i < CLASSHASH_SIZE; i++) {
 		head = classhash_table + i;
-		if (!head)
-			continue;
 		hlist_for_each_entry_rcu(class, head, hash_entry) {
 			if (within(class->key, start, size))
 				zap_class(class);

@@ -3987,8 +3985,6 @@ void lockdep_reset_lock(struct lockdep_m
 	locked = graph_lock();
 	for (i = 0; i < CLASSHASH_SIZE; i++) {
 		head = classhash_table + i;
-		if (!head)
-			continue;
 		hlist_for_each_entry_rcu(class, head, hash_entry) {
 			int match = 0;
 

_