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

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Date:	Wed, 4 Mar 2015 10:32:03 +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 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.
>
> Kim
>
>

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