linux-kernel - add config symbols for arch_{setup,teardown}_dma

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Message-Id: <20190204081420.15083-1-hch@lst.de>
Date:   Mon,  4 Feb 2019 09:14:18 +0100
From:   Christoph Hellwig <hch@....de>
To:     Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Paul Burton <paul.burton@...s.com>
Cc:     linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: add config symbols for arch_{setup,teardown}_dma_ops

Hi all,

this series adds kconfig symbols to indicate that the architecture
provides the arch_setup_dma_ops and arch_teardown_dma_ops hooks.

This avoids polluting dma-mapping.h which is included by just about
every driver with implementation details, and also removes some
clutter.