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

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Message-ID: <CA+55aFwKYSwytooG50fyryWpVdGEk_v=vdB=L-kAyLmmSW=bkQ@mail.gmail.com>
Date:	Tue, 6 Aug 2013 10:48:51 -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 Tue, Aug 6, 2013 at 7:19 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> After playing with the patches again, I now understand why I did that.
> It wasn't just for optimization.

[explanation snipped]

> Anyway, if you feel that update_jump_label is too complex, I can go the
> "update at early boot" route and see how that goes.

Ugh. I'd love to see short jumps, but I do dislike binary rewriting,
and doing it at early boot seems really quite scary too.

So I wonder if this is a "ok, let's not bother, it's not worth the
pain" issue. 128 bytes of offset is very small, so there probably
aren't all that many cases that would use it.

                 Linus
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