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Date: Tue, 9 Apr 2019 05:22:41 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC PATCH 03/12] s390/mm: force swiotlb for protected
 virtualization
Message-ID: <20190409122241.GA9312@infradead.org>
References: <20190404231622.52531-1-pasic@linux.ibm.com>
 <20190404231622.52531-4-pasic@linux.ibm.com>
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To: Halil Pasic <pasic@linux.ibm.com>
Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, Cornelia Huck <cohuck@redhat.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Sebastian Ott <sebott@linux.ibm.com>, virtualization@lists.linux-foundation.org, Christian Borntraeger <borntraeger@de.ibm.com>, Viktor Mihajlovski <mihajlov@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Janosch Frank <frankja@linux.ibm.com>, Claudio Imbrenda <imbrenda@linux.ibm.com>, Farhan Ali <alifm@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>
List-ID: <linux-s390.vger.kernel.org>

> +++ b/arch/s390/include/asm/dma-mapping.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_S390_DMA_MAPPING_H
> +#define _ASM_S390_DMA_MAPPING_H
> +
> +#include <linux/dma-contiguous.h>
> +
> +static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
> +{
> +	return NULL;
> +}
> +
> +#endif /* _ASM_S390_DMA_MAPPING_H */
> +

Congratulations!  You ust create an entirely pointless duplicate of
include/asm-generic/dma-mapping.h.