linux-kernel - Re: [PATCH] soc: TI knav_qmss: fix dma_addr

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Date:	Tue, 8 Dec 2015 08:53:53 -0800
From:	santosh shilimkar <santosh.shilimkar@...cle.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Murali Karicheri <m-karicheri2@...com>
Cc:	Santosh Shilimkar <ssantosh@...nel.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"Kwok, WingMan" <w-kwok2@...com>
Subject: Re: [PATCH] soc: TI knav_qmss: fix dma_addr_t printing

On 12/8/2015 7:30 AM, Arnd Bergmann wrote:
> The knav_qmss driver is currently broken when CONFIG_LPAE is
> set, which is a bit surprising because I'd expect that any serious
> users of this platforms would have more than 2GB of RAM and require
> LPAE.
>
Well it has been working with LPAE enable always. The production
systems do but IIRC, some of the Eval board were still build with
just 2 GB memory.

> The compiler clearly warns about an incorrect use of dma_addr_t
> in the debug kernel messages:
>
> ti/knav_qmss_queue.c: In function 'knav_queue_setup_region':
> ti/knav_qmss_queue.c:1025:117: warning: format '%x' expects argument of type 'unsigned int', but argument 9 has type 'dma_addr_t {aka long long unsigned int}' [-Wformat=]
> ti/knav_qmss_queue.c:1025:117: warning: format '%x' expects argument of type 'unsigned int', but argument 10 has type 'dma_addr_t {aka long long unsigned int}' [-Wformat=]
> ti/knav_qmss_queue.c: In function 'knav_queue_setup_link_ram':
> ti/knav_qmss_queue.c:1175:118: warning: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'dma_addr_t {aka long long unsigned int}' [-Wformat=]
>
%x should have been %llx or %pad as your patch does now.

> This patch changes all the debugging output to use the correct
> %pad format string that works with both 32-bit and 64-bit dma_addr_t.
> As the variable naming is somewhat confusing here, I also change
> all *_phys names to *_dma when they refer to bus addresses that
> are used for DMA rather than a physical memory address as seen from
> the CPU. This is particularly important on keystone, because the
> two things are not the same there.
>
Right. Rename sounds good.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
Thanks for the patch Arnd !!

Wingman/Murali,
Can you guys please test this patch and update the thread ?
I will queue this up for next merge window.

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