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

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Date:	Sat, 01 Jun 2013 13:31:25 -0700
From:	Joe Perches <joe@...ches.com>
To:	Emil Goode <emilgoode@...il.com>,
	Stepan Moskovchenko <stepanm@...eaurora.org>
Cc:	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 21:09 +0200, Emil Goode wrote:
> I see, will send a second version.

Hey Emil.

I believe you can not use %pa with a dma_addr_t
because that could be a different size than a
phy_addr_t.

(the vsprintf cast and deref is to a phy_addr_t)

The definitions are: (types.h)

#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
typedef u64 dma_addr_t;
#else
typedef u32 dma_addr_t;
#endif /* dma_addr_t */

[]

#ifdef CONFIG_PHYS_ADDR_T_64BIT
typedef u64 phys_addr_t;
#else
typedef u32 phys_addr_t;
#endif

On Sat, Jun 01, 2013 at 11:29:10AM -0700, Joe Perches wrote:
> On Sat, 2013-06-01 at 20:02 +0200, Emil Goode wrote:
> > This patch makes use of the new format specifier %pa that was introduced
> > by the following commit.
> > 
> > 7d7992108d02aa92ad4c77e5d9ce14088c942e75
> > ("lib/vsprintf.c: add %pa format specifier for phys_addr_t types")
> []
> > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> []
> > @@ -1756,12 +1756,11 @@ void musb_host_rx(struct musb *musb, u8 epnum)
> []
> > -                   dev_dbg(musb->controller, "RX%d count %d, buffer 0x%llx len %d/%d\n",
> > +                   dev_dbg(musb->controller, "RX%d count %d, buffer 0x%pa len %d/%d\n",
> 
> This would emit 0x0x<addr>


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