From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Re: [PATCH 5/7 v2] xen-gntdev: Add reference
	counting to maps
Date: Mon, 10 Jan 2011 17:28:11 -0500
Message-ID: <20110110222811.GG15016@dumpdata.com>
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> -static int gntdev_del_map(struct grant_map *map)
> +static void gntdev_put_map(struct grant_map *map)

Aha.. here it is.

.. snip ..
> @@ -606,6 +594,8 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
>  		goto unlock_out;
>  	}
>  
> +	atomic_inc(&map->users);
> +
>  	vma->vm_ops = &gntdev_vmops;
>  
>  	vma->vm_flags |= VM_RESERVED;
> @@ -614,6 +604,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
>  	vma->vm_flags |= VM_PFNMAP;
>  
>  	vma->vm_private_data = map;
> +

No need for that.