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

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Date:	Tue, 06 Aug 2013 09:19:53 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 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.

	-hpa


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