dma_declare_coherent spring cleaning

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Subject: dma_declare_coherent spring cleaning
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 11 Feb 2019 14:35:42 +0100
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Lee Jones <lee.jones@xxxxxxxxxx>, x86@xxxxxxxxxx, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

this series removes various bits of dead code and refactors the
remaining functionality around dma_declare_coherent to be a somewhat
more coherent code base.

Follow-Ups:
- [PATCH 04/12] of: select OF_RESERVED_MEM automatically
  - From: Christoph Hellwig
- [PATCH 05/12] dma-mapping: remove an incorrect __iommem annotation
  - From: Christoph Hellwig
- [PATCH 06/12] dma-mapping: improve selection of dma_declare_coherent availability
  - From: Christoph Hellwig
- [PATCH 07/12] dma-mapping: move CONFIG_DMA_CMA to kernel/dma/Kconfig
  - From: Christoph Hellwig
- [PATCH 08/12] dma-mapping: remove dma_mark_declared_memory_occupied
  - From: Christoph Hellwig
- [PATCH 12/12] dma-mapping: remove dma_assign_coherent_memory
  - From: Christoph Hellwig
- [PATCH 09/12] dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag
  - From: Christoph Hellwig
- [PATCH 11/12] dma-mapping: handle per-device coherent memory mmap in common code
  - From: Christoph Hellwig
- [PATCH 10/12] dma-mapping: simplify allocations from per-device coherent memory
  - From: Christoph Hellwig
- [PATCH 03/12] of: mark early_init_dt_alloc_reserved_memory_arch static
  - From: Christoph Hellwig
- [PATCH 02/12] device.h: dma_mem is only needed for HAVE_GENERIC_DMA_COHERENT
  - From: Christoph Hellwig
- [PATCH 01/12] mfd/sm501: depend on HAS_DMA
  - From: Christoph Hellwig

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