linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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Message-ID: <4D55B5E8.2040306@zytor.com>
Date:	Fri, 11 Feb 2011 14:19:20 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	rostedt@...dmis.org, mingo@...e.hu, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

On 02/11/2011 02:15 PM, Jason Baron wrote:
> 
> a bit of history...
> 
> For the disabled jump label case, we didn't want to incur an atomic_read() to
> check if the branch was enabled.
> 
> So, I separated the API, to have one for the non-atomic case, and one
> for the atomic case. Nobody liked that.
> 
> So now, I'm proposing to leave the core API based around a non-atomic
> variable, and have any callers that want to use this atomic interface,
> to call into the non-atomic interface. If another user besides perf
> wants to use the same type of atomic interface, we can re-visit the
> decsion? 
> 

What is the problem with taking the atomic_read()?

	-hpa
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