linux-kernel - Re: [PATCH 11/15] purgatory: Core purgatory functionality

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Message-ID: <20140811181543.GD1863@redhat.com>
Date:	Mon, 11 Aug 2014 14:15:43 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Shaun Ruffell <sruffell@...ium.com>, linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org, ebiederm@...ssion.com,
	mjg59@...f.ucam.org, greg@...ah.com, bp@...en8.de,
	dyoung@...hat.com, chaowang@...hat.com, bhe@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 11/15] purgatory: Core purgatory functionality

On Mon, Aug 11, 2014 at 11:08:48AM -0700, H. Peter Anvin wrote:
> On 08/11/2014 11:02 AM, Vivek Goyal wrote:
> > 
> > Hi hpa,
> > 
> > I took it because kexec-tools uses it and in one of the committs Eric
> > gave following reasoning.
> > 
> >     On x86_64 use -mcmodel=large so that the code is built without
> >     any 32bit assumptions.  -mcmodel=medium and -mcmodel=small
> >     result int code that has 32bit relocations against variables
> >     that can live anywhere in the address space
> > 
> > We do want to load purgatory anywhere in the address space. 
> > 
> > But if there are other ways to achieve the same thing, I will do that
> > change.
> > 
> > So when you say "small PIC", I need to use -mcmodel=small and -fPIC?
> > 
> 
> Actually -fPIE is probably better than -fPIC.
> 
> -mcmodel=large is incompatible with all other code out there, which
> means that even though it is supposed to work it will be poorly tested
> at best.  So even despite the gcc version issue, using the small PIC
> model would be better.

Ok, I will give it a try.

Thanks
Vivek
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