Re: [patch 9/9] mutex subsystem, XFS namespace collision fixes

[Christoph Hellwig <hch@infradead.org>]

> -#define mutex_init(lock, type, name)		sema_init(lock, 1)
> -#define mutex_destroy(lock)			sema_init(lock, -99)
> -#define mutex_lock(lock, num)			down(lock)
> -#define mutex_trylock(lock)			(down_trylock(lock) ? 0 : 1)
> -#define mutex_unlock(lock)			up(lock)
> +#define xfs_mutex_init(lock, type, name)	sema_init(lock, 1)
> +#define xfs_mutex_destroy(lock)			sema_init(lock, -99)
> +#define xfs_mutex_lock(lock, num)		down(lock)
> +#define xfs_mutex_trylock(lock)			(down_trylock(lock) ? 0 : 1)
> +#define xfs_mutex_unlock(lock)			up(lock)

Again, this should really be using the mutex primitives (obviously ;-)).

The patch should become (pseudo-patch):

-typedef struct semaphore	mutex_t
-
-#define mutex_init(lock, type, name)		sema_init(lock, 1)
-#define mutex_destroy(lock)			sema_init(lock, -99)
-#define mutex_lock(lock, num)			down(lock)
-#define mutex_trylock(lock)			(down_trylock(lock) ? 0 : 1)
-#define mutex_unlock(lock)			up(lock)
+#define mutex_init(lock, type, name)		mutex_init(lock)
+#define mutex_destroy(lock)			do { } while (0)

While we're at it, maybe we should a mutex_destroy aswell?  it would
be non-mandatory and allow that a lock is gone for the debugging variant.
-
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