[PATCH 1/6] sparc: remove no needed sbus_dma_ops methods

[David Miller]

From: Christoph Hellwig <hch at lst.de>
Date: Sat,  8 Dec 2018 09:41:10 -0800

> No need to BUG_ON() on the cache maintainance ops - they are no-ops
> by default, and there is nothing in the DMA API contract that prohibits
> calling them on sbus devices (even if such drivers are unlikely to
> ever appear).
> 
> Similarly a dma_supported method that always returns 0 is rather
> pointless.  The only thing that indicates is that no one ever calls
> the method on sbus devices.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Acked-by: David S. Miller <davem at davemloft.net>