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

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Message-ID: <20110217125145.GB27504@elte.hu>
Date:	Thu, 17 Feb 2011 13:51:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, simoneau@....uri.edu,
	will.newton@...il.com, matt@...sole-pimps.org, rostedt@...dmis.org,
	peterz@...radead.org, jbaron@...hat.com,
	mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org,
	vapier@...too.org, cmetcalf@...era.com, dhowells@...hat.com,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates


* H. Peter Anvin <hpa@...or.com> wrote:

> On 02/16/2011 12:35 AM, Ingo Molnar wrote:
> > 
> > Just curious: how does this work if there's an interrupt (or NMI) right after the 
> > invalidate instruction but before the 'll' instruction? The IRQ/NMI may refill the 
> > L1. Or are the two instructions coupled by hw (they form a single instruction in 
> > essence) and irqs/NMIs are inhibited inbetween?
> > 
> 
> http://en.wikipedia.org/wiki/Load-link/store-conditional

Oh, ll/sc, that indeed clicks - i even wrote such assembly code many years ago ;-)

Thanks,

	Ingo
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