Re: [LOCKDEP] xfs: possible recursive locking detected

[Ingo Molnar <mingo@elte.hu>]

another thing: i have added real 'lock allocation debugging' 
(CONFIG_DEBUG_LOCK_ALLOC) to the kernel, which covers spinlocks, 
rwlocks, mutexes and rw-semaphores. It does the following:

         This feature will check whether any held lock (spinlock, rwlock,
         mutex or rwsem) is incorrectly freed by the kernel, via any of the
         memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
         vfree(), etc.), whether a live lock is incorrectly reinitialized via
         spin_lock_init()/mutex_init()/etc., or whether there is any lock
         held during task exit.

so i suspect:

 fs/xfs/xfs_mount.h:#define   AIL_LOCK_DESTROY(x)     spinlock_destroy(x)
 fs/xfs/linux-2.6/spin.h:#define      spinlock_destroy(lock)

needs to change and we need to implement spinlock_destroy(), a'ka 
mutex_destroy()? [which i added recently too]

	Ingo