Merge branch 'core/locking' into core/urgent

4 files changed, 58 insertions, 22 deletions

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 2486eb4edbf1..331e5f1c2d8e 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -89,6 +89,7 @@ struct lock_class {
 
         struct lockdep_subclass_key     *key;
         unsigned int                    subclass;
+        unsigned int                    dep_gen_id;
 
         /*
          * IRQ/softirq usage tracking bits:
@@ -189,6 +190,14 @@ struct lock_chain {
         u64                             chain_key;
 };
 
+#define MAX_LOCKDEP_KEYS_BITS           13
+/*
+ * Subtract one because we offset hlock->class_idx by 1 in order
+ * to make 0 mean no class. This avoids overflowing the class_idx
+ * bitfield and hitting the BUG in hlock_class().
+ */
+#define MAX_LOCKDEP_KEYS                ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1)
+
 struct held_lock {
         /*
          * One-way hash of the dependency chain up to this point. We
@@ -205,14 +214,14 @@ struct held_lock {
          * with zero), here we store the previous hash value:
          */
         u64                             prev_chain_key;
-        struct lock_class               *class;
         unsigned long                   acquire_ip;
         struct lockdep_map              *instance;
-
+        struct lockdep_map              *nest_lock;
 #ifdef CONFIG_LOCK_STAT
         u64                             waittime_stamp;
         u64                             holdtime_stamp;
 #endif
+        unsigned int                    class_idx:MAX_LOCKDEP_KEYS_BITS;
         /*
          * The lock-stack is unified in that the lock chains of interrupt
          * contexts nest ontop of process context chains, but we 'separate'
@@ -226,11 +235,11 @@ struct held_lock {
          * The following field is used to detect when we cross into an
          * interrupt context:
          */
-        int                             irq_context;
-        int                             trylock;
-        int                             read;
-        int                             check;
-        int                             hardirqs_off;
+        unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
+        unsigned int trylock:1;
+        unsigned int read:2;        /* see lock_acquire() comment */
+        unsigned int check:2;       /* see lock_acquire() comment */
+        unsigned int hardirqs_off:1;
 };
 
 /*
@@ -294,11 +303,15 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
  *   2: full validation
  */
 extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
-                         int trylock, int read, int check, unsigned long ip);
+                         int trylock, int read, int check,
+                         struct lockdep_map *nest_lock, unsigned long ip);
 
 extern void lock_release(struct lockdep_map *lock, int nested,
                          unsigned long ip);
 
+extern void lock_set_subclass(struct lockdep_map *lock, unsigned int subclass,
+                              unsigned long ip);
+
 # define INIT_LOCKDEP                           .lockdep_recursion = 0,
 
 #define lockdep_depth(tsk)      (debug_locks ? (tsk)->lockdep_depth : 0)
@@ -313,8 +326,9 @@ static inline void lockdep_on(void)
 {
 }
 
-# define lock_acquire(l, s, t, r, c, i)         do { } while (0)
+# define lock_acquire(l, s, t, r, c, n, i)      do { } while (0)
 # define lock_release(l, n, i)                  do { } while (0)
+# define lock_set_subclass(l, s, i)             do { } while (0)
 # define lockdep_init()                         do { } while (0)
 # define lockdep_info()                         do { } while (0)
 # define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0)
@@ -400,9 +414,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # ifdef CONFIG_PROVE_LOCKING
-#  define spin_acquire(l, s, t, i)              lock_acquire(l, s, t, 0, 2, i)
+#  define spin_acquire(l, s, t, i)              lock_acquire(l, s, t, 0, 2, NULL, i)
+#  define spin_acquire_nest(l, s, t, n, i)      lock_acquire(l, s, t, 0, 2, n, i)
 # else
-#  define spin_acquire(l, s, t, i)              lock_acquire(l, s, t, 0, 1, i)
+#  define spin_acquire(l, s, t, i)              lock_acquire(l, s, t, 0, 1, NULL, i)
+#  define spin_acquire_nest(l, s, t, n, i)      lock_acquire(l, s, t, 0, 1, NULL, i)
 # endif
 # define spin_release(l, n, i)                  lock_release(l, n, i)
 #else
@@ -412,11 +428,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # ifdef CONFIG_PROVE_LOCKING
-#  define rwlock_acquire(l, s, t, i)            lock_acquire(l, s, t, 0, 2, i)
-#  define rwlock_acquire_read(l, s, t, i)       lock_acquire(l, s, t, 2, 2, i)
+#  define rwlock_acquire(l, s, t, i)            lock_acquire(l, s, t, 0, 2, NULL, i)
+#  define rwlock_acquire_read(l, s, t, i)       lock_acquire(l, s, t, 2, 2, NULL, i)
 # else
-#  define rwlock_acquire(l, s, t, i)            lock_acquire(l, s, t, 0, 1, i)
-#  define rwlock_acquire_read(l, s, t, i)       lock_acquire(l, s, t, 2, 1, i)
+#  define rwlock_acquire(l, s, t, i)            lock_acquire(l, s, t, 0, 1, NULL, i)
+#  define rwlock_acquire_read(l, s, t, i)       lock_acquire(l, s, t, 2, 1, NULL, i)
 # endif
 # define rwlock_release(l, n, i)                lock_release(l, n, i)
 #else
@@ -427,9 +443,9 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # ifdef CONFIG_PROVE_LOCKING
-#  define mutex_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 2, i)
+#  define mutex_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 2, NULL, i)
 # else
-#  define mutex_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 1, i)
+#  define mutex_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 1, NULL, i)
 # endif
 # define mutex_release(l, n, i)                 lock_release(l, n, i)
 #else
@@ -439,11 +455,11 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # ifdef CONFIG_PROVE_LOCKING
-#  define rwsem_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 2, i)
-#  define rwsem_acquire_read(l, s, t, i)        lock_acquire(l, s, t, 1, 2, i)
+#  define rwsem_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 2, NULL, i)
+#  define rwsem_acquire_read(l, s, t, i)        lock_acquire(l, s, t, 1, 2, NULL, i)
 # else
-#  define rwsem_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 1, i)
-#  define rwsem_acquire_read(l, s, t, i)        lock_acquire(l, s, t, 1, 1, i)
+#  define rwsem_acquire(l, s, t, i)             lock_acquire(l, s, t, 0, 1, NULL, i)
+#  define rwsem_acquire_read(l, s, t, i)        lock_acquire(l, s, t, 1, 1, NULL, i)
 # endif
 # define rwsem_release(l, n, i)                 lock_release(l, n, i)
 #else
@@ -452,4 +468,16 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 # define rwsem_release(l, n, i)                 do { } while (0)
 #endif
 
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# ifdef CONFIG_PROVE_LOCKING
+#  define lock_map_acquire(l)           lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_)
+# else
+#  define lock_map_acquire(l)           lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_)
+# endif
+# define lock_map_release(l)                    lock_release(l, 1, _THIS_IP_)
+#else
+# define lock_map_acquire(l)                    do { } while (0)
+# define lock_map_release(l)                    do { } while (0)
+#endif
+
 #endif /* __LINUX_LOCKDEP_H */
diff --git a/include/linux/rcuclassic.h b/include/linux/rcuclassic.h
index 8c774905dcfe..4ab843622727 100644
--- a/include/linux/rcuclassic.h
+++ b/include/linux/rcuclassic.h
@@ -117,7 +117,7 @@ extern int rcu_needs_cpu(int cpu);
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 extern struct lockdep_map rcu_lock_map;
 # define rcu_read_acquire()     \
-                        lock_acquire(&rcu_lock_map, 0, 0, 2, 1, _THIS_IP_)
+                        lock_acquire(&rcu_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
 # define rcu_read_release()     lock_release(&rcu_lock_map, 1, _THIS_IP_)
 #else
 # define rcu_read_acquire()     do { } while (0)
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 61e5610ad165..e0c0fccced46 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -183,8 +183,14 @@ do {								\
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
+# define spin_lock_nest_lock(lock, nest_lock)                           \
+         do {                                                           \
+                 typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
+                 _spin_lock_nest_lock(lock, &(nest_lock)->dep_map);     \
+         } while (0)
 #else
 # define spin_lock_nested(lock, subclass) _spin_lock(lock)
+# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
 #endif
 
 #define write_lock(lock)                _write_lock(lock)
diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index 8a2307ce7296..d79845d034b5 100644
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -22,6 +22,8 @@ int in_lock_functions(unsigned long addr);
 void __lockfunc _spin_lock(spinlock_t *lock)            __acquires(lock);
 void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
                                                         __acquires(lock);
+void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map)
+                                                        __acquires(lock);
 void __lockfunc _read_lock(rwlock_t *lock)              __acquires(lock);
 void __lockfunc _write_lock(rwlock_t *lock)             __acquires(lock);
 void __lockfunc _spin_lock_bh(spinlock_t *lock)         __acquires(lock);