linux-kernel - Re: [PATCH] usb: musb: use the new %pa format specifier for dma_addr

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Message-ID: <1370124960.2098.9.camel@joe-AO722>
Date:	Sat, 01 Jun 2013 15:16:00 -0700
From:	Joe Perches <joe@...ches.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	Emil Goode <emilgoode@...il.com>,
	Stepan Moskovchenko <stepanm@...eaurora.org>, balbi@...com,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] usb: musb: use the new %pa format specifier for
 dma_addr_t

On Sat, 2013-06-01 at 14:56 -0700, Randy Dunlap wrote:
> It's a bit of a shame that this
> comment was deleted from include/asm-generic/types.h in commit
> 3e50594e8e72932ad4cfcb0b3cbdf58fc3bce416:
> 
> -/*
> - * DMA addresses may be very different from physical addresses
> - * and pointers. i386 and powerpc may have 64 bit DMA on 32 bit
> - * systems, while sparc64 uses 32 bit DMA addresses for 64 bit
> - * physical addresses.
> - * This default defines dma_addr_t to have the same size as
> - * phys_addr_t, which is the most common way.
> - * Do not define the dma64_addr_t type, which never really
> - * worked.
> - */

Hey Randy.

You could always put it back.


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