Re: [PATCH] watch_queue: Fix missing locking in watch_queue_set_size()

[Cen Zhang (Microsoft)]

> +	/* Use lock since watches may already be attached. */
> +	spin_lock_bh(&wqueue->lock);
>  	wqueue->notes = pages;
>  	wqueue->notes_bitmap = bitmap;
>  	wqueue->nr_pages = nr_pages;
>  	wqueue->nr_notes = nr_notes;
> +	spin_unlock_bh(&wqueue->lock);

I'll send a v2 tomorrow, replacing the lock with smp_store_release()/
smp_load_acquire() for wqueue->nr_notes.