linux-kernel - RE: Interesting csd deadlock on ARC

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Message-ID: <HE1PR05MB162584392E880F4306659593AAA40@HE1PR05MB1625.eurprd05.prod.outlook.com>
Date:	Tue, 23 Feb 2016 10:58:29 +0000
From:	Noam Camus <noamca@...lanox.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	arcml <linux-snps-arc@...ts.infradead.org>
Subject: RE: Interesting csd deadlock on ARC

>From: Peter Zijlstra [mailto:peterz@...radead.org] 
>Sent: Tuesday, February 23, 2016 12:40 PM

>The only requirement for irq_work is that it runs after the NMI completes and runs from regular IRQ context. >There are no strict interrupt priority requirements, only that it happens.

We here already use self IPI and irq_work on ARC (with no NMI concerns).
Please see patch at:
https://github.com/EZchip/linux/commit/e42556738e610295f917c79dae166373cd11de88

Noam