linux-kernel - Re: [PATCH 01/10] x86/iommu: Add IOMMU_INIT macros, .iommu_table section, and iommu_table

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Message-ID: <20100827143844.GA32547@phenom.dumpdata.com>
Date:	Fri, 27 Aug 2010 10:38:44 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	hpa@...or.com, fujita.tomonori@....ntt.co.jp,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 01/10] x86/iommu: Add IOMMU_INIT macros, .iommu_table
 section, and iommu_table_entry structure.

On Thu, Aug 26, 2010 at 08:19:13PM +0200, Sam Ravnborg wrote:
> > diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> > index d0bb522..b92e040 100644
> > --- a/arch/x86/kernel/vmlinux.lds.S
> > +++ b/arch/x86/kernel/vmlinux.lds.S
> > @@ -260,6 +260,13 @@ SECTIONS
> >  		*(.altinstr_replacement)
> >  	}
> >  
> > +	.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
> > +		__iommu_table = .;
> > +		*(.iommu_table)
> > +		. = ALIGN(8);
> > +		__iommu_table_end = .;
> > +	}
> > +
> 
> So we have yet another magic section in vmlinux.lds.S
> A nice comemnt that expalins what this is used for and why
> it is discardable etc. would be nice.
> 
> Lots of magic sections in same file miss this,
> but thats not an example to follwow.

Sure. Will provide one and also explain the other sections that I am
familiar with.

Thanks for your feedback!
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