From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Olof Johansson <olof@lixom.net>
Cc: Randy Dunlap <rdunlap@infradead.org>,
Vinod Koul <vinod.koul@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Shawn Guo <shawn.guo@linaro.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] dma: use %pa to print dma_addr_t
Date: Thu, 12 Sep 2013 18:35:54 +0100 [thread overview]
Message-ID: <20130912173554.GQ12758@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAOesGMi2VkBzvXtK9eftViaWBRFGdv6TgzYZ6NCKQfhKWZGVWA@mail.gmail.com>
On Thu, Sep 12, 2013 at 10:11:44AM -0700, Olof Johansson wrote:
> Any >32bit-addressable machine will likely want 64-bit dma_addr_t as
> well. The only architecture that doesn't seem to set
> ARCH_DMA_ADDR_T_64BIT based on PHYS_ADDR_T size is ARM, and I think
> that should just be changed there as well.
Do we actually have any 64-bit DMA controllers out there? As far as
I'm aware, all our DMA controllers are all 32-bit address only. That
makes a 64-bit dma_addr_t rather silly.
Remember that dma_addr_t is the value you program into the DMA
controller, and _not_ the actual physical address.
next prev parent reply other threads:[~2013-09-12 17:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-12 4:38 Olof Johansson
2013-09-12 17:05 ` Randy Dunlap
2013-09-12 17:11 ` Olof Johansson
2013-09-12 17:35 ` Russell King - ARM Linux [this message]
2013-09-12 17:45 ` Olof Johansson
2013-09-12 17:44 ` Dan Williams
2013-09-12 17:29 ` Joe Perches
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