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

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Message-ID: <1375732925.22073.150.camel@gandalf.local.home>
Date:	Mon, 05 Aug 2013 16:02:05 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	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 Mon, 2013-08-05 at 12:57 -0700, Linus Torvalds wrote:
> On Mon, Aug 5, 2013 at 12:54 PM, Mathieu Desnoyers
> <mathieu.desnoyers@...icios.com> wrote:
> >
> > I remember that choosing between 2 and 5 bytes nop in the asm goto was
> > tricky: it had something to do with the fact that gcc doesn't know the
> > exact size of each instructions until further down within compilation
> 
> Oh, you can't do it in the coompiler, no. But you don't need to. The
> assembler will pick the right version if you just do "jmp target".

Right, and that's exactly what my patches did.

-- Steve


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