linux-kernel - Re: Preventing IPI sending races in arch code

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Message-ID: <52944131.2040609@synopsys.com>
Date:	Tue, 26 Nov 2013 12:05:29 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	"Noam Camus" <noamc@...hip.com>,
	David Daney <david.daney@...ium.com>,
	James Hogan <james.hogan@...tec.com>,
	thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Richard Kuo <rkuo@...eaurora.org>
Subject: Re: Preventing IPI sending races in arch code

On 11/26/2013 10:41 AM, Benjamin Herrenschmidt wrote:
>> Right, but the issue per-se is not clobbering of msg holder, but from POV of
>> > receiver, seeming coalescing of 2 set_bit writes to msg holder.
> That's fine. There's no expectation that N ipi_send_msg turn into N
> messages received... it turns into at least one.

OK, I was not aware of that relaxation in semantics.

Thx,
-Vineet
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