linux-kernel - Re: [RFC] gcc feature request: Moving blocks into sections

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Message-ID: <20130813075048.GR27162@twins.programming.kicks-ass.net>
Date:	Tue, 13 Aug 2013 09:50:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Mon, Aug 12, 2013 at 10:47:37AM -0700, H. Peter Anvin wrote:
> On 08/12/2013 09:09 AM, Peter Zijlstra wrote:
> >>
> >> On the majority of architectures, including x86, you cannot simply copy
> >> a piece of code elsewhere and have it still work.
> > 
> > I thought we used -fPIC which would allow just that.
> > 
> 
> Doubly wrong.  The kernel is not compiled with -fPIC, nor does -fPIC
> allow this kind of movement for code that contains intramodule
> references (that is *all* references in the kernel).  Since we really
> doesn't want to burden the kernel with a GOT and a PLT, that is life.

OK. never mind then..
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