netdev - fix the non-coherent coldfire dma_alloc

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Date: Fri, 20 Oct 2023 07:40:16 +0200
From: Christoph Hellwig <hch@....de>
To: Greg Ungerer <gerg@...ux-m68k.org>,
	iommu@...ts.linux.dev
Cc: Robin Murphy <robin.murphy@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Wei Fang <wei.fang@....com>,
	Shenwei Wang <shenwei.wang@....com>,
	Clark Wang <xiaoning.wang@....com>,
	NXP Linux Team <linux-imx@....com>,
	linux-m68k@...ts.linux-m68k.org,
	netdev@...r.kernel.org
Subject: fix the non-coherent coldfire dma_alloc_coherent v4

Hi all,

this is the next attempt to not return memory that is not DMA coherent
on coldfire/m68knommu.  The last one needed more fixups in the fec
driver, which this versions includes.  On top of that I've also added
a few more cleanups to the core DMA allocation code.

Note: without the separately submitted

   fix a few RISC-V / renesas Kconfig dependencies

series this will cause Kconfig warnings on riscv.   These warnings are
due to real dependency issues, so I do not plan to hold the series for
those patches to be applied.


Changes since v2:
 - drop the separatly submitted riscv/soc patches and rebase on top of the
   soc tree
 - rename CONFIG_ARCH_DMA_ALLOC to ARCH_HAS_DMA_ALLOC
 - fix stray CONFIG_ prefixes in a Kconfig file

Changes since v1:
 - sort out the dependency mess in RISCV
 - don't even built non-coherent DMA support for coldfire cores without
   data caches
 - apply the fec workarounds to all coldfire platforms with data caches
 - add a trivial cleanup for m68k dma.c