linux-kernel - Re: Microblaze linux support

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Date:	Thu, 19 Mar 2009 12:04:49 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org, john.williams@...alogix.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Microblaze linux support

Ingo Molnar wrote:
> * Michal Simek <monstr@...str.eu> wrote:
> 
>> Ingo Molnar wrote:
>>> * Michal Simek <monstr@...str.eu> wrote:
>>>
>>>> Hi Ingo,
>>>>> * Michal Simek <monstr@...str.eu> wrote:
>>>>>
>>>>>> WARNING: externs should be avoided in .c files
>>>>>> #110: FILE: arch/microblaze/kernel/microblaze_ksyms.c:45:
>>>>>> +extern void __umodsi3(void);
>>>>>>
>>>>>> WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
>>>>>> #111: FILE: arch/microblaze/kernel/microblaze_ksyms.c:46:
>>>>>> +EXPORT_SYMBOL(__umodsi3);
>>>>> externs should be in header files.
>>>>>
>>>>> The rest indeed looks like false positives. Thanks for addressing 
>>>>> these things so quickly!
>>>> you are welcome - I can quickly test and add all changes to git.
>>>>
>>>> Is it good style separate extern definition and EXPORT_SYMBOL?
>>>>
>>>> I have three choices?
>>>> 1. keep extern + EXPORT_SYMBOL below  - current style
>>>> 2. move only extern to header file
>>>> 3. move extern and EXPORT_SYMBOL to header.
>>>>
>>>> What is preferable way?
>>> Where are the symbols defined - by gcc's library?
>> yes.
> 
> i suspect it's borderline in that case, and your solution is fine. 
> The other solution would be to stuff the externs into a header and 
> have a continuous block of exports with a comment that says:
> 
>  /*
>   * GCC library functions:
>   */
>  EXPORT_SYMBOL(...);
>  EXPORT_SYMBOL(...);
>  EXPORT_SYMBOL(...);

Ok. I keep it in current style. Everything is one file and there is comment
about.

Thanks,
Michal

> 	Ingo

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