linux-kernel - Re: [PATCH 1/3] crypto: caam: fix some compile warnings

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Date:	Wed, 4 Mar 2015 12:57:01 +0800
From:	yjin <yanjiang.jin@...driver.com>
To:	Kim Phillips <kim.phillips@...escale.com>
CC:	<horia.geanta@...escale.com>, <herbert@...dor.apana.org.au>,
	<davem@...emloft.net>, <ruchika.gupta@...escale.com>,
	<cristian.stoica@...escale.com>, <NiteshNarayanLal@...escale.com>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<jinyanjiang@...il.com>
Subject: Re: [PATCH 1/3] crypto: caam: fix some compile warnings


On 2015年03月04日 10:32, yjin wrote:
>
> On 2015年03月04日 02:59, Kim Phillips wrote:
>> On Tue, 3 Mar 2015 14:50:51 +0800
>> <yanjiang.jin@...driver.com> wrote:
>>
>>> This commit is to avoid the below warnings:
>>>
>>> drivers/crypto/caam/sg_sw_sec4.h:88:12: warning:
>>> 'dma_map_sg_chained' defined but not used [-Wunused-function]
>>>   static int dma_map_sg_chained(struct device *dev, struct 
>>> scatterlist *sg,
>>>              ^
>>> drivers/crypto/caam/sg_sw_sec4.h:104:12: warning:
>>> 'dma_unmap_sg_chained' defined but not used [-Wunused-function]
>>>   static int dma_unmap_sg_chained(struct device *dev,
>>>              ^
>> I'm not seeing these warnings - both caamalg.c and caamhash.c use
>> those functions fine.
>
> As you said, both caamalg.c and caamhash.c use those functions, so no 
> warning reported.
>
> But if a new file just wants to include "sg_sw_sec4.h", doesn't want 
> to use these functions, the above warnings will appear.
>
> We can find an example in Freescale SDK 1.6:
> caampkc.c includes pkc_desc.h, pkc_desc.h includes sg_sw_sec4.h, but 
> caampkc.c doesn't call those functions.
>
> Without my patch, every file which includes sg_sw_sec4.h must call 
> these two functions in the future, I don't think it is a good idea.
>
> Thanks!
> Yanjiang
>>
>>> -static int dma_map_sg_chained(struct device *dev, struct 
>>> scatterlist *sg,
>>> +static inline int dma_map_sg_chained(struct device *dev, struct 
>>> scatterlist *sg,
>>>                     unsigned int nents, enum dma_data_direction dir,
>>>                     bool chained)
>> not to mention this isn't how to fix a defined but not used warning:
>> marking the functions inline results in different compiler output.
>>
>> NACK from me.
An alternative is moving the definitions to a ".c" file, but I don't 
think it will be fundamental different.
I know I am fixing a potential error which doesn't exist now, it seems 
useless for the current upstream version, we can abandon my patch. But I 
still think the current implementation adds unnecessary restrictions for 
its users.

Thanks!
Yanjiang
>>
>> Kim
>>
>>
>
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