From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: An MCA ESP driver
Date: Tue, 07 Aug 2007 00:26:04 -0700 (PDT)
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From: Matthew Wilcox <matthew@wil.cx>
Date: Mon, 6 Aug 2007 17:24:58 -0600

> @@ -514,11 +514,14 @@ struct esp {
>  
>  	struct completion	*eh_reset;
>  
> -	struct sbus_dma		*dma;
> +	union {
> +		struct sbus_dma	*sbus_dma;
> +		unsigned int	x86_dma;
> +	};
>  };

Feel free to make this a "void *dma_cookie" or similar.
It's private to the bus front-end.