linux-kernel - Re: [PATCH v6 6/7] arm64, jump label: optimize jump label implementation

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Message-ID: <20131213155513.GI19177@mudshark.cambridge.arm.com>
Date:	Fri, 13 Dec 2013 15:55:13 +0000
From:	Will Deacon <will.deacon@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jiang Liu <liuj97@...il.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 6/7] arm64, jump label: optimize jump label
 implementation

On Fri, Dec 13, 2013 at 03:50:23PM +0000, Steven Rostedt wrote:
> On Fri, 13 Dec 2013 15:41:04 +0000
> Will Deacon <will.deacon@....com> wrote:
> 
> > > +#include <linux/kernel.h>
> > > +#include <linux/jump_label.h>
> > > +#include <asm/jump_label.h>
> > > +#include <asm/insn.h>
> > > +
> > > +#ifdef HAVE_JUMP_LABEL
> > 
> > Slightly worrying... this should be CONFIG_HAVE_JUMP_LABEL, right? How did
> > you manage to test this code?
> 
> In <linux/jump_label.h> we have:
> 
> #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
> 
> [...]
> 
> # include <asm/jump_label.h>
> # define HAVE_JUMP_LABEL
> #endif	/* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
> 

Phew, that explains things! Cheers, Steve.

Will
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