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lockdep: annotate rcu_read_{,un}lock{,_bh}

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lockdep annotate rcu_read_{,un}lock{,_bh} in order to catch imbalanced
usage.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Peter Zijlstra 2007-10-11 22:11:12 +02:00
parent 34a3d1e837
commit 851a67b825
3 changed files with 29 additions and 0 deletions
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7
include/linux/lockdep.h
View file

@ -252,6 +252,13 @@ extern void lockdep_on(void);
extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
struct lock_class_key *key, int subclass);
/*
* To initialize a lockdep_map statically use this macro.
* Note that _name must not be NULL.
*/
#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
{ .name = (_name), .key = (void *)(_key), }
/*
* Reinitialize a lock key - for cases where there is special locking or
* special initialization of locks so that the validator gets the scope

14
include/linux/rcupdate.h
View file

@ -41,6 +41,7 @@
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <linux/seqlock.h>
#include <linux/lockdep.h>
/**
* struct rcu_head - callback structure for use with RCU
@ -133,6 +134,15 @@ static inline void rcu_bh_qsctr_inc(int cpu)
extern int rcu_pending(int cpu);
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_)
# define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_)
#else
# define rcu_read_acquire() do { } while (0)
# define rcu_read_release() do { } while (0)
#endif
/**
* rcu_read_lock - mark the beginning of an RCU read-side critical section.
*
@ -166,6 +176,7 @@ extern int rcu_needs_cpu(int cpu);
do { \
preempt_disable(); \
__acquire(RCU); \
rcu_read_acquire(); \
} while(0)
/**
@ -175,6 +186,7 @@ extern int rcu_needs_cpu(int cpu);
*/
#define rcu_read_unlock() \
do { \
rcu_read_release(); \
__release(RCU); \
preempt_enable(); \
} while(0)
@ -204,6 +216,7 @@ extern int rcu_needs_cpu(int cpu);
do { \
local_bh_disable(); \
__acquire(RCU_BH); \
rcu_read_acquire(); \
} while(0)
/*
@ -213,6 +226,7 @@ extern int rcu_needs_cpu(int cpu);
*/
#define rcu_read_unlock_bh() \
do { \
rcu_read_release(); \
__release(RCU_BH); \
local_bh_enable(); \
} while(0)

8
kernel/rcupdate.c
View file

@ -49,6 +49,14 @@
#include <linux/cpu.h>
#include <linux/mutex.h>
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key rcu_lock_key;
struct lockdep_map rcu_lock_map =
STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
EXPORT_SYMBOL_GPL(rcu_lock_map);
#endif
/* Definition for rcupdate control block. */
static struct rcu_ctrlblk rcu_ctrlblk = {
.cur = -300,