lockdep: sanitise CONFIG_PROVE_LOCKING

Ensure that all of the lock dependency tracking code is under
CONFIG_PROVE_LOCKING.  This allows us to use the held lock tracking code for
other purposes.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/lockdep.c

@@ -95,6 +95,7 @@ static int lockdep_initialized;
 unsigned long nr_list_entries;
 static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
 
+#ifdef CONFIG_PROVE_LOCKING
 /*
  * Allocate a lockdep entry. (assumes the graph_lock held, returns
  * with NULL on failure)
@@ -111,6 +112,7 @@ static struct lock_list *alloc_list_entry(void)
 	}
 	return list_entries + nr_list_entries++;
 }
+#endif
 
 /*
  * All data structures here are protected by the global debug_lock.
@@ -140,7 +142,9 @@ LIST_HEAD(all_lock_classes);
 static struct list_head classhash_table[CLASSHASH_SIZE];
 
 unsigned long nr_lock_chains;
+#ifdef CONFIG_PROVE_LOCKING
 static struct lock_chain lock_chains[MAX_LOCKDEP_CHAINS];
+#endif
 
 /*
  * We put the lock dependency chains into a hash-table as well, to cache
@@ -482,6 +486,7 @@ static void print_lock_dependencies(struct lock_class *class, int depth)
 	}
 }
 
+#ifdef CONFIG_PROVE_LOCKING
 /*
  * Add a new dependency to the head of the list:
  */
@@ -541,6 +546,7 @@ print_circular_bug_entry(struct lock_list *target, unsigned int depth)
 
 	return 0;
 }
+#endif
 
 static void print_kernel_version(void)
 {
@@ -549,6 +555,7 @@ static void print_kernel_version(void)
 		init_utsname()->version);
 }
 
+#ifdef CONFIG_PROVE_LOCKING
 /*
  * When a circular dependency is detected, print the
  * header first:
@@ -639,6 +646,7 @@ check_noncircular(struct lock_class *source, unsigned int depth)
 	}
 	return 1;
 }
+#endif
 
 static int very_verbose(struct lock_class *class)
 {
@@ -823,6 +831,7 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
 
 #endif
 
+#ifdef CONFIG_PROVE_LOCKING
 static int
 print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
 		   struct held_lock *next)
@@ -1087,7 +1096,7 @@ check_prevs_add(struct task_struct *curr, struct held_lock *next)
 
 	return 0;
 }
-
+#endif
 
 /*
  * Is this the address of a static object:
@@ -1307,6 +1316,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
 	return class;
 }
 
+#ifdef CONFIG_PROVE_LOCKING
 /*
  * Look up a dependency chain. If the key is not present yet then
  * add it and return 1 - in this case the new dependency chain is
@@ -1381,6 +1391,7 @@ static inline int lookup_chain_cache(u64 chain_key, struct lock_class *class)
 
 	return 1;
 }
+#endif
 
 /*
  * We are building curr_chain_key incrementally, so double-check

kernel/spinlock.c

@@ -88,7 +88,7 @@ unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
 	 * _raw_spin_lock_flags() code, because lockdep assumes
 	 * that interrupts are not re-enabled during lock-acquire:
 	 */
-#ifdef CONFIG_PROVE_LOCKING
+#ifdef CONFIG_LOCKDEP
 	_raw_spin_lock(lock);
 #else
 	_raw_spin_lock_flags(lock, &flags);
@@ -305,7 +305,7 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclas
 	 * _raw_spin_lock_flags() code, because lockdep assumes
 	 * that interrupts are not re-enabled during lock-acquire:
 	 */
-#ifdef CONFIG_PROVE_SPIN_LOCKING
+#ifdef CONFIG_LOCKDEP
 	_raw_spin_lock(lock);
 #else
 	_raw_spin_lock_flags(lock, &flags);