linux-kernel - Re: [PATCH v3 2/4] DMA-API: Change dma_declare_coherent_memory() CPU address to phys_addr

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Date:	Fri, 9 May 2014 04:50:14 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-doc@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	linux-kernel@...r.kernel.org,
	James Bottomley <jbottomley@...allels.com>,
	linux-pci@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v3 2/4] DMA-API: Change dma_declare_coherent_memory() CPU
 address to phys_addr_t

On Thu, May 08, 2014 at 02:49:00PM -0600, Bjorn Helgaas wrote:
> dma_declare_coherent_memory() takes two addresses for a region of memory: a
> "bus_addr" and a "device_addr".  I think the intent is that "bus_addr" is
> the physical address a *CPU* would use to access the region, and
> "device_addr" is the bus address the *device* would use to address the
> region.
> 
> Rename "bus_addr" to "phys_addr" and change its type to phys_addr_t.
> Most callers already supply a phys_addr_t for this argument.  The others
> supply a 32-bit integer (a constant, unsigned int, or __u32) and need no
> change.
> 
> Use "unsigned long", not phys_addr_t, to hold PFNs.
> 
> No functional change (this could theoretically fix a truncation in a config
> with 32-bit dma_addr_t and 64-bit phys_addr_t, but I don't think there are
> any such cases involving this code).
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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