linux-kernel - Re: [PATCH] drivers: staging: lustre: lustre: include: add "__attribute_

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Date:	Sun, 19 Jan 2014 18:07:16 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	devel@...verdev.osuosl.org, James Hogan <james.hogan@...tec.com>,
	andreas.dilger@...el.com, Greg KH <gregkh@...uxfoundation.org>,
	bergwolf@...il.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	oleg.drokin@...el.com, jacques-charles.lafoucriere@....fr,
	jinshan.xiong@...el.com, linux-metag@...r.kernel.org
Subject: Re: [PATCH] drivers: staging: lustre: lustre: include: add "__attribute__((packed))"
 for the related union

On 01/18/2014 10:24 PM, Dan Carpenter wrote:
> On Sat, Jan 18, 2014 at 06:26:10PM +0800, Chen Gang wrote:
>> On 01/18/2014 06:05 PM, Dan Carpenter wrote:
>>> On Sat, Jan 18, 2014 at 05:50:34PM +0800, Chen Gang wrote:
>>>> Unfortunately, not all compilers assumes the structures within a pack
>>>> region also need be packed (e.g. metag), so need add a pack explicitly
>>>> to satisfy all compilers.
>>>>
>>>> The related error (under metag with allmodconfig):
>>>>
>>>>     CC [M]  drivers/staging/lustre/lustre/lov/lov_pack.o
>>>>   drivers/staging/lustre/lustre/lov/lov_pack.c: In function 'lov_getstripe':
>>>>   drivers/staging/lustre/lustre/lov/lov_pack.c:630: error: duplicate case value
>>>>   drivers/staging/lustre/lustre/lov/lov_pack.c:630: error: previously used here
>>>>
>>>> And originally, all related code used "__attribute__((packed))", so
>>>> still use it instead of '__packed'.
>>>
>>> Use __packed.  Then at least one line will be correct which is better
>>> than nothing.
>>>
>>
>> Hmm... but that will break the 'consistency' (which is not quite good
>> for readers).
>>
>> For me, it will be better to provide another patch to change all
>> "__attribute__((packed))" to "__packed" within this file.
>>
>> What about your ideas?
>>
> 
> In the end, it's not something we care about enough to ask you to redo
> the patch.  But what I'm saying is that you should prefer kernel style
> over local style.  We'll fix the surrounding lines later.
> 

OK, thanks, and also thank James and "./scripts/checkpatch.pl" who/which
also mentioned about it to me.


BTW: this patch is related with another patch which is discussing (so I
have cc that patch to you and Greg too): "if we could sure that it is a
compiler's feature issue, we will skip this patch".


Thanks
-- 
Chen Gang

Open, share and attitude like air, water and life which God blessed
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