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

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Date:	Sun, 2 Jun 2013 01:06:12 +0200
From:	Emil Goode <emilgoode@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	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

Hello Joe and Randy,

Maybe there should be another format specifier %da and Randy's
clarifying comment
can be added there to the documentation?

Best regards,

Emil Goode

On Sat, Jun 01, 2013 at 03:16:00PM -0700, Joe Perches wrote:
> 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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