audit: fix info leak in AUDIT_GET requests
[linux-3.10.git] / kernel / lockdep_internals.h
index c3600a0..4f560cf 100644 (file)
@@ -7,6 +7,45 @@
  */
 
 /*
+ * Lock-class usage-state bits:
+ */
+enum lock_usage_bit {
+#define LOCKDEP_STATE(__STATE)         \
+       LOCK_USED_IN_##__STATE,         \
+       LOCK_USED_IN_##__STATE##_READ,  \
+       LOCK_ENABLED_##__STATE,         \
+       LOCK_ENABLED_##__STATE##_READ,
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+       LOCK_USED,
+       LOCK_USAGE_STATES
+};
+
+/*
+ * Usage-state bitmasks:
+ */
+#define __LOCKF(__STATE)       LOCKF_##__STATE = (1 << LOCK_##__STATE),
+
+enum {
+#define LOCKDEP_STATE(__STATE)                                         \
+       __LOCKF(USED_IN_##__STATE)                                      \
+       __LOCKF(USED_IN_##__STATE##_READ)                               \
+       __LOCKF(ENABLED_##__STATE)                                      \
+       __LOCKF(ENABLED_##__STATE##_READ)
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+       __LOCKF(USED)
+};
+
+#define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
+#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
+
+#define LOCKF_ENABLED_IRQ_READ \
+               (LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
+#define LOCKF_USED_IN_IRQ_READ \
+               (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
+
+/*
  * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
  * we track.
  *
  * table (if it's not there yet), and we check it for lock order
  * conflicts and deadlocks.
  */
-#define MAX_LOCKDEP_ENTRIES    8192UL
+#define MAX_LOCKDEP_ENTRIES    16384UL
 
-#define MAX_LOCKDEP_KEYS_BITS  11
-#define MAX_LOCKDEP_KEYS       (1UL << MAX_LOCKDEP_KEYS_BITS)
-
-#define MAX_LOCKDEP_CHAINS_BITS        14
+#define MAX_LOCKDEP_CHAINS_BITS        15
 #define MAX_LOCKDEP_CHAINS     (1UL << MAX_LOCKDEP_CHAINS_BITS)
 
 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
 extern struct list_head all_lock_classes;
 extern struct lock_chain lock_chains[];
 
-extern void
-get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
+#define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
+
+extern void get_usage_chars(struct lock_class *class,
+                           char usage[LOCK_USAGE_CHARS]);
 
 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
 
@@ -53,31 +91,79 @@ extern unsigned int nr_process_chains;
 extern unsigned int max_lockdep_depth;
 extern unsigned int max_recursion_depth;
 
+extern unsigned int max_bfs_queue_depth;
+
+#ifdef CONFIG_PROVE_LOCKING
+extern unsigned long lockdep_count_forward_deps(struct lock_class *);
+extern unsigned long lockdep_count_backward_deps(struct lock_class *);
+#else
+static inline unsigned long
+lockdep_count_forward_deps(struct lock_class *class)
+{
+       return 0;
+}
+static inline unsigned long
+lockdep_count_backward_deps(struct lock_class *class)
+{
+       return 0;
+}
+#endif
+
 #ifdef CONFIG_DEBUG_LOCKDEP
+
+#include <asm/local.h>
 /*
- * Various lockdep statistics:
+ * Various lockdep statistics.
+ * We want them per cpu as they are often accessed in fast path
+ * and we want to avoid too much cache bouncing.
  */
-extern atomic_t chain_lookup_hits;
-extern atomic_t chain_lookup_misses;
-extern atomic_t hardirqs_on_events;
-extern atomic_t hardirqs_off_events;
-extern atomic_t redundant_hardirqs_on;
-extern atomic_t redundant_hardirqs_off;
-extern atomic_t softirqs_on_events;
-extern atomic_t softirqs_off_events;
-extern atomic_t redundant_softirqs_on;
-extern atomic_t redundant_softirqs_off;
-extern atomic_t nr_unused_locks;
-extern atomic_t nr_cyclic_checks;
-extern atomic_t nr_cyclic_check_recursions;
-extern atomic_t nr_find_usage_forwards_checks;
-extern atomic_t nr_find_usage_forwards_recursions;
-extern atomic_t nr_find_usage_backwards_checks;
-extern atomic_t nr_find_usage_backwards_recursions;
-# define debug_atomic_inc(ptr)         atomic_inc(ptr)
-# define debug_atomic_dec(ptr)         atomic_dec(ptr)
-# define debug_atomic_read(ptr)                atomic_read(ptr)
+struct lockdep_stats {
+       int     chain_lookup_hits;
+       int     chain_lookup_misses;
+       int     hardirqs_on_events;
+       int     hardirqs_off_events;
+       int     redundant_hardirqs_on;
+       int     redundant_hardirqs_off;
+       int     softirqs_on_events;
+       int     softirqs_off_events;
+       int     redundant_softirqs_on;
+       int     redundant_softirqs_off;
+       int     nr_unused_locks;
+       int     nr_cyclic_checks;
+       int     nr_cyclic_check_recursions;
+       int     nr_find_usage_forwards_checks;
+       int     nr_find_usage_forwards_recursions;
+       int     nr_find_usage_backwards_checks;
+       int     nr_find_usage_backwards_recursions;
+};
+
+DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
+
+#define __debug_atomic_inc(ptr)                                        \
+       this_cpu_inc(lockdep_stats.ptr);
+
+#define debug_atomic_inc(ptr)                  {               \
+       WARN_ON_ONCE(!irqs_disabled());                         \
+       __this_cpu_inc(lockdep_stats.ptr);                      \
+}
+
+#define debug_atomic_dec(ptr)                  {               \
+       WARN_ON_ONCE(!irqs_disabled());                         \
+       __this_cpu_dec(lockdep_stats.ptr);                      \
+}
+
+#define debug_atomic_read(ptr)         ({                              \
+       struct lockdep_stats *__cpu_lockdep_stats;                      \
+       unsigned long long __total = 0;                                 \
+       int __cpu;                                                      \
+       for_each_possible_cpu(__cpu) {                                  \
+               __cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu);   \
+               __total += __cpu_lockdep_stats->ptr;                    \
+       }                                                               \
+       __total;                                                        \
+})
 #else
+# define __debug_atomic_inc(ptr)       do { } while (0)
 # define debug_atomic_inc(ptr)         do { } while (0)
 # define debug_atomic_dec(ptr)         do { } while (0)
 # define debug_atomic_read(ptr)                0