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

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Message-ID: <1375806413.25420.36.camel@gandalf.local.home>
Date:	Tue, 06 Aug 2013 12:26:53 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Tue, 2013-08-06 at 09:19 -0700, H. Peter Anvin wrote:
> On 08/06/2013 09:15 AM, Steven Rostedt wrote:
> > On Mon, 2013-08-05 at 14:43 -0700, H. Peter Anvin wrote:
> > 
> >> For unconditional jmp that should be pretty safe barring any fundamental
> >> changes to the instruction set, in which case we can enable it as
> >> needed, but for extra robustness it probably should skip prefix bytes.
> > 
> > Would the assembler add prefix bytes to:
> > 
> > 	jmp 1f
> > 
> 
> No, but if we ever end up doing MPX in the kernel, for example, we would
> have to put an MPX prefix on the jmp.

Well then we just have to update the rest of the jump label code :-)

-- Steve


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