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rcu: Warn when rcu_read_lock() is used in extended quiescent state 

We are currently able to detect uses of rcu_dereference_check() inside
extended quiescent states (such as the RCU-free window in idle).
But rcu_read_lock() and friends can be used without rcu_dereference(),
so that the earlier commit checking for use of rcu_dereference() and
friends while in RCU idle mode miss some error conditions.  This commit
therefore adds extended quiescent state checking to rcu_read_lock() and
friends.

Uses of RCU from within RCU-idle mode are totally ignored by
RCU, hence the importance of these checks.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Frederic Weisbecker 2011-10-07 18:22:02 +02:00 committed by Paul E. McKenney
parent 0464e93748
commit 00f49e5729
1 changed files with 42 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
include/linux/rcupdate.h
View File

@ -237,21 +237,53 @@ static inline int rcu_is_cpu_idle(void)
}
#endif /* else !CONFIG_PROVE_RCU */
static inline void rcu_lock_acquire(struct lockdep_map *map)
{
WARN_ON_ONCE(rcu_is_cpu_idle());
lock_acquire(map, 0, 0, 2, 1, NULL, _THIS_IP_);
}
static inline void rcu_lock_release(struct lockdep_map *map)
{
WARN_ON_ONCE(rcu_is_cpu_idle());
lock_release(map, 1, _THIS_IP_);
}
extern struct lockdep_map rcu_lock_map;
# define rcu_read_acquire() \
lock_acquire(&rcu_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
# define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_)
static inline void rcu_read_acquire(void)
{
rcu_lock_acquire(&rcu_lock_map);
}
static inline void rcu_read_release(void)
{
rcu_lock_release(&rcu_lock_map);
}
extern struct lockdep_map rcu_bh_lock_map;
# define rcu_read_acquire_bh() \
lock_acquire(&rcu_bh_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
# define rcu_read_release_bh() lock_release(&rcu_bh_lock_map, 1, _THIS_IP_)
static inline void rcu_read_acquire_bh(void)
{
rcu_lock_acquire(&rcu_bh_lock_map);
}
static inline void rcu_read_release_bh(void)
{
rcu_lock_release(&rcu_bh_lock_map);
}
extern struct lockdep_map rcu_sched_lock_map;
# define rcu_read_acquire_sched() \
lock_acquire(&rcu_sched_lock_map, 0, 0, 2, 1, NULL, _THIS_IP_)
# define rcu_read_release_sched() \
lock_release(&rcu_sched_lock_map, 1, _THIS_IP_)
static inline void rcu_read_acquire_sched(void)
{
rcu_lock_acquire(&rcu_sched_lock_map);
}
static inline void rcu_read_release_sched(void)
{
rcu_lock_release(&rcu_sched_lock_map);
}
extern int debug_lockdep_rcu_enabled(void);