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

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Date:	Mon, 05 Aug 2013 11:33:57 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.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 08/05/2013 11:20 AM, Linus Torvalds wrote:
> 
> Of course, it would be good to optimize static_key_false() itself -
> right now those static key jumps are always five bytes, and while they
> get nopped out, it would still be nice if there was some way to have
> just a two-byte nop (turning into a short branch) *if* we can reach
> another jump that way..For small functions that would be lovely. Oh
> well.
> 

That would definitely require gcc support.  It would be useful, but
probably requires a lot of machinery.

	-hpa


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