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From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: iommu@lists.linux-foundation.org,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-xtensa@linux-xtensa.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] vmalloc: lift the arm flag for coherent mappings to common code
Date: Fri, 30 Aug 2019 10:29:18 +0100	[thread overview]
Message-ID: <20190830092918.GV13294@shell.armlinux.org.uk> (raw)
In-Reply-To: <20190830062924.21714-2-hch@lst.de>

On Fri, Aug 30, 2019 at 08:29:21AM +0200, Christoph Hellwig wrote:
> The arm architecture had a VM_ARM_DMA_CONSISTENT flag to mark DMA
> coherent remapping for a while.  Lift this flag to common code so
> that we can use it generically.  We also check it in the only place
> VM_USERMAP is directly check so that we can entirely replace that
> flag as well (although I'm not even sure why we'd want to allow
> remapping DMA appings, but I'd rather not change behavior).

Good, because if you did change that behaviour, you'd break almost
every ARM framebuffer and cripple ARM audio drivers.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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  reply	other threads:[~2019-08-30  9:29 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30  6:29 cleanup vmap usage in the dma-mapping layer Christoph Hellwig
2019-08-30  6:29 ` [PATCH 1/4] vmalloc: lift the arm flag for coherent mappings to common code Christoph Hellwig
2019-08-30  9:29   ` Russell King - ARM Linux admin [this message]
2019-08-30 14:59     ` Christoph Hellwig
2019-08-30  6:29 ` [PATCH 2/4] dma-mapping: always use VM_DMA_COHERENT for generic DMA remap Christoph Hellwig
2019-08-30  6:29 ` [PATCH 3/4] dma-mapping: introduce a dma_common_find_pages helper Christoph Hellwig
2019-10-02 12:05   ` Geert Uytterhoeven
2019-10-02 16:45     ` Robin Murphy
2019-10-06 18:45     ` Christoph Hellwig
2019-10-07  7:35       ` Geert Uytterhoeven
2019-08-30  6:29 ` [PATCH 4/4] arm: remove wrappers for the generic dma remap helpers Christoph Hellwig

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