linux-kernel - Re: [git pull] x86 updates

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Date:	Tue, 5 Feb 2008 22:54:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [git pull] x86 updates

* Sam Ravnborg <sam@...nborg.org> wrote:

> > btw., what's the practical consequence of getting these section 
> > flags wrong - for example writable data can end up in executable 
> > section accidentally and be marked readonly by RODATA? Or can 
> > anything more serious happen? (they cannot get into any of the 
> > discarded sections, we filter for them explicitly in the linker 
> > scripts)
>
> I have not investigated this. My attention were due to section 
> mismatch warnings pointing to section names I could not find in the 
> code. When I did an objdump of vmlinux the funny section names were 
> gone so I expected ld had recognized them and merged them somehow - 
> but I did not look closer as my focus was to get rid of them anyway.

ah, indeed. if we have the same section name but different attributes 
then i guess gas/ld resolves the conflict by auto-generating these 
.1/.2, etc. artificial sections. They dont show up in the vmlinux 
because they went through the linker scripts that merges them into a 
single output section. But modpost picks up those pre-merge names.

> I also did a quick skimming of info ld - but no luck.

Peter pointed me to "info gas", which has a "Sections and Relocation" 
chapter.

	Ingo
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