There seem to be some unbalanced rcu_read_{,un}lock() issues of late, how about doing something like this:
Signed-off-by: Peter Zijlstra <[EMAIL PROTECTED]> --- include/linux/lockdep.h | 7 +++++++ include/linux/rcupdate.h | 12 ++++++++++++ kernel/rcupdate.c | 8 ++++++++ 3 files changed, 27 insertions(+) Index: linux-2.6/include/linux/lockdep.h =================================================================== --- linux-2.6.orig/include/linux/lockdep.h +++ linux-2.6/include/linux/lockdep.h @@ -252,6 +252,13 @@ extern void lockdep_init_map(struct lock 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 * of dependencies wrong: they are either too broad (they need a class-split) Index: linux-2.6/include/linux/rcupdate.h =================================================================== --- linux-2.6.orig/include/linux/rcupdate.h +++ linux-2.6/include/linux/rcupdate.h @@ -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 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) Index: linux-2.6/kernel/rcupdate.c =================================================================== --- linux-2.6.orig/kernel/rcupdate.c +++ linux-2.6/kernel/rcupdate.c @@ -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, - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html