linux-kernel - Re: Microblaze linux support

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Date:	Thu, 19 Mar 2009 12:00:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michal Simek <monstr@...str.eu>
Cc:	linux-kernel@...r.kernel.org, john.williams@...alogix.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Microblaze linux support


* 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(...);

	Ingo
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