From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Sat, 12 Feb 2011 10:34:13 +0000
Subject: [PATCH v4 16/19] ARM: LPAE: Use generic dma_addr_t type definition
In-Reply-To: <1295891761-18366-17-git-send-email-catalin.marinas@arm.com>
References: <1295891761-18366-1-git-send-email-catalin.marinas@arm.com>
	<1295891761-18366-17-git-send-email-catalin.marinas@arm.com>
Message-ID: <20110212103413.GD15616@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Mon, Jan 24, 2011 at 05:55:58PM +0000, Catalin Marinas wrote:
> From: Will Deacon <will.deacon@arm.com>
> 
> This patch uses the types.h implementation in asm-generic to define the
> dma_addr_t type as the same width as phys_addr_t.
> 
> NOTE: this is a temporary patch until the corresponding patches unifying
> the dma_addr_t and removing the dma64_addr_t are merged into mainline.

I'm not too sure about this patch.  All of the DMA devices we have only
take 32-bit addresses for their DMA, so making dma_addr_t 64-bit seems
wrong as we'll implicitly truncate these addresses.

As ARM platforms don't (sanely) support DMA, I think dropping this patch
for the time being would be a good idea, and stick with 32-bit dma_addr_t,
especially as we need to first do a sweep for dma_addr_t usage in device
driver structures (such as dma engine scatter lists.)  These really should
use __le32/__be32/u32 depending on whether they're little endian, big
endian or native endian.