linux-kernel - Re: [34-longterm 074/179] xen: Use IRQF_FORCE

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Message-ID: <20120515050221.GA4292@burratino>
Date:	Tue, 15 May 2012 00:02:21 -0500
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [34-longterm 074/179] xen: Use IRQF_FORCE_RESUME

Hi Paul,

Paul Gortmaker wrote:

> From: Thomas Gleixner <tglx@...utronix.de>
[...]
>     If you see a problem with using this for longterm, please comment.
[...]
> commit 676dc3cf5bc36a9e129a3ad8fe3bd7b2ebf20f5d upstream.
>
> Mark the IRQF_NO_SUSPEND interrupts IRQF_FORCE_RESUME and remove the extra
> walk through the interrupt descriptors.

This produces resume failures and migration failures in Xen guests[1].

Commit 9bab0b7fbace (genirq: Add IRQF_RESUME_EARLY and resume such
IRQs earlier, 2011-11-09) is needed on top to avoid regressions.

Hope that helps,
Jonathan

[1] http://thread.gmane.org/gmane.linux.kernel/1198673
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