linux-kernel - Re: [RFC][PATCH 6/7] jump_label: Add a new static

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Message-ID: <20150727105036.GO18673@twins.programming.kicks-ass.net>
Date:	Mon, 27 Jul 2015 12:50:36 +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
Subject: Re: [RFC][PATCH 6/7] jump_label: Add a new static_key interface

On Mon, Jul 27, 2015 at 12:47:55PM +0200, Peter Zijlstra wrote:
> On Mon, Jul 27, 2015 at 12:20:46PM +0200, Heiko Carstens wrote:
> > On Mon, Jul 27, 2015 at 11:52:25AM +0200, Peter Zijlstra wrote:
> > > > +static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
> > > > +{
> > > > +	asm_volatile_goto("0:	j %l[l_yes]\n"
> > > 
> > > Looking at the s390 version of jump_label_make_branch(), this should
> > > have been:
> > > 
> > > 		"brcl 15, %l[l_yes]\n"
> > > 
> > > I suppose?
> > 
> > Yes. I wanted to test your version, but I assume you will send
> > an updated version soon?
> 
> I just send out updated patches for 5/6. They boot without issue on my
> x86_64.

Also, it helps if you convert one static_key user into something that'll
trigger this new code.

The one I picked is unfortunately rather x86 specific.
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