linux-kernel - Re: [PATCH RFT] microblaze: dma-mapping: support debug_dma_mapping

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Date:	Fri, 26 Oct 2012 17:57:28 +0200
From:	Michal Simek <monstr@...str.eu>
To:	shuah.khan@...com
CC:	kyungmin.park@...sung.com, m.szyprowski@...sung.com, arnd@...db.de,
	andrzej.p@...sung.com, microblaze-uclinux@...e.uq.edu.au,
	LKML <linux-kernel@...r.kernel.org>, shuahkhan@...il.com
Subject: Re: [PATCH RFT] microblaze: dma-mapping: support debug_dma_mapping_error

On 10/26/2012 04:58 PM, Shuah Khan wrote:
> On Fri, 2012-10-26 at 10:29 +0200, Michal Simek wrote:
>> On 10/26/2012 01:29 AM, Shuah Khan wrote:
>>> Add support for debug_dma_mapping_error() call to avoid warning from
>>> debug_dma_unmap() interface when it checks for mapping error checked
>>> status. Without this patch, device driver failed to check map error
>>> warning is generated.
>>>
>>> Signed-off-by: Shuah Khan <shuah.khan@...com>
>>> ---
>>>    arch/microblaze/include/asm/dma-mapping.h |    1 +
>>>    1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
>>> index 01d2282..4451c7a 100644
>>> --- a/arch/microblaze/include/asm/dma-mapping.h
>>> +++ b/arch/microblaze/include/asm/dma-mapping.h
>>> @@ -114,6 +114,7 @@ static inline void __dma_sync(unsigned long paddr,
>>>    static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
>>>    {
>>>    	struct dma_map_ops *ops = get_dma_ops(dev);
>>
>> here should be empty line.
>>
>>> +	debug_dma_mapping_error(dev, dma_addr);
>>>    	if (ops->mapping_error)
>>>    		return ops->mapping_error(dev, dma_addr);
>>
>> Patch looks good to me. I was greping the latest mainline tree and I can't see
>> reference to debug_dma_mapping_error. Can you tell me where this function
>> is implemented.
>> I have also seen that you have sent several similar patches like this.
>>
>> If you want to add it through any other tree here is my ACK:
>>
>> Acked-by: Michal Simek <monstr@...str.eu>
>>
>> I will definitely keep my eyes on it.
>
> debug_dma_mapping_error() patch is in linux-next. I probably should send
> all of these patches marked explicitly for linux-next.

Ok. It means that this patch should be added to the tree which contains this
patch. You can find it out through linux-next.

What it is interesting to me is that arm tree has it there but implementation
is missing in Linus tree.

[linux-2.6.x]$ grep -rn "debug_dma_mapping_erro" arch/
arch/arm/include/asm/dma-mapping.h:94:	debug_dma_mapping_error(dev, dma_addr);

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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