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

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Message-ID: <CA+55aFyfvifCu=jDBH8LPmEHtvooVyo25dvJ+T6SQLhVidBBdQ@mail.gmail.com>
Date:	Mon, 5 Aug 2013 11:49:56 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	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, Aug 5, 2013 at 11:39 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> I had patches that did exactly this:
>
>  https://lkml.org/lkml/2012/3/8/461
>
> But it got dropped for some reason. I don't remember why. Maybe because
> of the complexity?

Ugh. Why the crazy update_jump_label script stuff? I'd go "Eww" at
that too, it looks crazy. The assembler already knows to make short
2-byte "jmp" instructions for near jumps, and you can just look at the
opcode itself to determine size, why is all that other stuff required?

IOW, 5/7 looks sane, but 4/7 makes me go "there's something wrong with
that series".

                 Linus
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