linux-kernel - Re: [PATCH -v2 0/8] jump_label: Another (better) static

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Message-ID: <20150729085853.GJ19282@twins.programming.kicks-ass.net>
Date:	Wed, 29 Jul 2015 10:58:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jasonbaron0@...il.com, bp@...en8.de, luto@...capital.net,
	tglx@...utronix.de, rostedt@...dmis.org, will.deacon@....com,
	liuj97@...il.com, rabin@....in, ralf@...ux-mips.org,
	ddaney@...iumnetworks.com, benh@...nel.crashing.org,
	michael@...erman.id.au, davem@...emloft.net, vbabka@...e.cz
Subject: Re: [PATCH -v2 0/8] jump_label: Another (better) static_key interface

On Wed, Jul 29, 2015 at 08:46:00AM +0200, Heiko Carstens wrote:
> On Tue, Jul 28, 2015 at 03:20:55PM +0200, Peter Zijlstra wrote:
> > Hi all,
> > 
> > After yet another bug because of the weirdness of the static key interface,
> > here an attempt at providing a better one.
> > 
> > This series is tested on x86_64 (by me) and s390x (heiko).
> 
> Works nice. You may include the s390 patch below, so the conversion to the
> new interface happens when your code gets merged:
> 
> From 3c9b5a2b9a90d6bb2b41f381f5f89b3657fe4ea5 Mon Sep 17 00:00:00 2001
> From: Heiko Carstens <heiko.carstens@...ibm.com>
> Date: Wed, 29 Jul 2015 08:31:24 +0200
> Subject: [PATCH] s390/uaccess: employ static_branch_likely()
> 
> Use the new static_branch_likely() primitive to make sure that the
> most likely case is executed without taking an unconditional branch.
> This wasn't possible with the old jump label primitives.
> 
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>

Thanks!
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