linux-kernel - Re: [PATCH] x86: pgtable_32.h - prototype and section mismatch fixes

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Message-ID: <20080414085927.GC11372@uranus.ravnborg.org>
Date:	Mon, 14 Apr 2008 10:59:27 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jacek Luczak <difrost.kernel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: pgtable_32.h - prototype and section mismatch fixes

On Mon, Apr 14, 2008 at 10:53:07AM +0200, Ingo Molnar wrote:
> 
> * Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > > hm, that's an interesting case: we need those annotations probably 
> > > because gcc decided to not inline those functions. (this is possible 
> > > via the new CONFIG_OPTIMIZE_INLINING=y option) Sam, what's your take 
> > > on that?
> > 
> > gcc uses different heuristics for inlining between the different 
> > versions. Therefore to achieve somehow predictable results I added 
> > -fno-inline-functions-called-once when CONFIG_DEBUG_SECTION_MISMATCH 
> > is enabled.
> > 
> > So in the above case for any normal kernel build we would see that gcc 
> > inlined the above and everything is fine. But for the 
> > CONFIG_DEBUG_SECTION_MISMTCH cases we do not inline and thus we see 
> > that we have a section mismatch.
> 
> ah, ok. So i guess this will result in a few isolated cases of __init 
> annotations added to inline functions - Jacek fixed one such case - but 
> it should not result in the general spreading of __init annotations to 
> inline functions, correct? (which i was worried about)
I do not think so. The need for small isolated inline functions
in the init paths are minimal and last I did a section mismatch free
sweep on the kernel it was only few if any inline functions(*) I had
to annotate.

(*) Considering only the minimal amount of function that ought
to be annotated inlined.

	Sam
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