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From: Will Deacon <will@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Shawn Anastasio <shawn@anastas.io>,
	linux-m68k@lists.linux-m68k.org, Guan Xuetao <gxt@pku.edu.cn>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	Russell King <linux@armlinux.org.uk>,
	linux-mips@vger.kernel.org, iommu@lists.linux-foundation.org,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Paul Burton <paul.burton@mips.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	James Hogan <jhogan@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 6/6] arm64: document the choice of page attributes for pgprot_dmacoherent
Date: Fri, 16 Aug 2019 19:05:22 +0100
Message-ID: <20190816180522.gocqeayajlbu4gzp@willie-the-truck> (raw)
In-Reply-To: <20190816175942.GA4879@lst.de>

On Fri, Aug 16, 2019 at 07:59:42PM +0200, Christoph Hellwig wrote:
> On Fri, Aug 16, 2019 at 06:31:18PM +0100, Will Deacon wrote:
> > Mind if I tweak the second sentence to be:
> > 
> >   This is different from "Device-nGnR[nE]" memory which is intended for MMIO
> >   and thus forbids speculation, preserves access size, requires strict
> >   alignment and can also force write responses to come from the endpoint.
> > 
> > ? It's a small change, but it better fits with the arm64 terminology
> > ("strongly ordered" is no longer used in the architecture).
> > 
> > If you're happy with that, I can make the change and queue this patch
> > for 5.4.
> 
> I'm fine with the change, but you really need this series as base,
> as there is no pgprot_dmacoherent before the series.  So I think I'll
> have to queue it up if we want it for 5.4, and I'll need a few more
> reviews for the other patches in this series first.

Ah, I didn't think about the contextual stuff. In which case, with my
change in wording:

Acked-by: Will Deacon <will@kernel.org>

and feel free to route it with the rest.

Thanks,

Will

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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16  7:07 cleanup the dma_pgprot handling Christoph Hellwig
2019-08-16  7:07 ` [PATCH 1/6] MIPS: remove support for DMA_ATTR_WRITE_COMBINE Christoph Hellwig
2019-08-16  7:07 ` [PATCH 2/6] unicore32: remove the unused pgprot_dmacoherent define Christoph Hellwig
2019-08-16  7:07 ` [PATCH 3/6] arm-nommu: " Christoph Hellwig
2019-08-16  7:07 ` [PATCH 4/6] dma-mapping: remove arch_dma_mmap_pgprot Christoph Hellwig
2019-08-16  7:43   ` Geert Uytterhoeven
2019-08-16  7:07 ` [PATCH 5/6] dma-mapping: make dma_atomic_pool_init self-contained Christoph Hellwig
2019-08-16  7:07 ` [PATCH 6/6] arm64: document the choice of page attributes for pgprot_dmacoherent Christoph Hellwig
2019-08-16 17:31   ` Will Deacon
2019-08-16 17:36     ` Mark Rutland
2019-08-16 17:59     ` Christoph Hellwig
2019-08-16 18:05       ` Will Deacon [this message]
2019-08-23 21:58 ` cleanup the dma_pgprot handling Paul Burton
2019-08-24 22:34   ` Christoph Hellwig

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