linux-kernel - Re: [RFC v1 5/8] x86/init: move ebda reservations into linker table

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Message-ID: <20151217234007.GW20409@wotan.suse.de>
Date:	Fri, 18 Dec 2015 00:40:07 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>, mcb30@...e.org,
	Juergen Gross <jgross@...e.com>,
	Jan Beulich <JBeulich@...e.com>,
	Joerg Roedel <joro@...tes.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	long.wanglong@...wei.com, qiuxishi@...wei.com,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	valentinrothberg@...il.com, peter.senna@...il.com,
	Michal Marek <mmarek@...e.com>, X86 ML <x86@...nel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v1 5/8] x86/init: move ebda reservations into linker table

On Thu, Dec 17, 2015 at 12:57:49PM -0800, Andy Lutomirski wrote:
> On Thu, Dec 17, 2015 at 12:55 PM, H. Peter Anvin <hpa@...or.com> wrote:
> > On 12/17/15 12:48, Andy Lutomirski wrote:
> >>
> >> I'm entirely ignorant of anything going on in gPXE/iPXE.
> >>
> >> Can you explain what a linker table *does*?  It looks like all you've
> >> done in this patch is to move code around.  What actually happens?
> >>
> >
> > A linker table is a data structure that is stitched together from items
> > in multiple object files.
> >
> > We already have a *bunch* of linker tables in Linux, mostly the init
> > tables, but they are all built in an ad hoc manner which requires linker
> > script modifications, which are of course per architecture.
> >
> > My desire would be to make a general linker table facility so that a new
> > linker table can be implemented by changing C code only.
> 
> Sounds good to me.

That's what this actually accomplishes, there are just a few caveats to consider,
more on this shortly on the other thread in this patch series.

  Luis
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