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authorIngo Molnar <mingo@elte.hu>2008-08-12 00:11:49 +0200
committerIngo Molnar <mingo@elte.hu>2008-08-12 00:11:49 +0200
commit23a0ee908cbfba3264d19729c67c22b20fa73886 (patch)
tree541103f6283cbac6b82cff88a7b91128acfce046 /include/linux
parentcc7a486cac78f6fc1a24e8cd63036bae8d2ab431 (diff)
parent0f2bc27be27ca1dcc66b96131e44bf7648b959c6 (diff)
Merge branch 'core/locking' into core/urgent
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/lockdep.h70
-rw-r--r--include/linux/rcuclassic.h2
-rw-r--r--include/linux/spinlock.h6
-rw-r--r--include/linux/spinlock_api_smp.h2
4 files changed, 58 insertions, 22 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 2486eb4edbf..331e5f1c2d8 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 8c774905dcf..4ab84362272 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 61e5610ad16..e0c0fccced4 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 8a2307ce729..d79845d034b 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);