linux-kernel - Re: [PATCH 00/10] jump label: introduce very

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Message-ID: <4F45050B.4080001@zytor.com>
Date:	Wed, 22 Feb 2012 07:08:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...hat.com>, a.p.zijlstra@...llo.nl,
	mathieu.desnoyers@...icios.com, davem@...emloft.net,
	ddaney.cavm@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 00/10] jump label: introduce very_[un]likely + cleanups
 + docs

On 02/22/2012 12:18 AM, Ingo Molnar wrote:
> 
> For example could you tell *at a glance* what this does:
> 
> +       if (!static_branch_def_false(&perf_sched_events.key))
> 
> ?

Yes.  Unlike

> +       if (very_unlikely(&perf_sched_events.key))

... which is actively misleading.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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