linux-kernel - Re: [PATCH v2] MSI-HOWTO.txt: remove reference on IRQF

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Message-ID: <20150227151707.3bf64000@lwn.net>
Date:	Fri, 27 Feb 2015 15:17:07 -0700
From:	Jonathan Corbet <corbet@....net>
To:	Valentin Rothberg <Valentin.Rothberg@...6.fr>
Cc:	bhelgaas@...gle.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] MSI-HOWTO.txt: remove reference on IRQF_DISABLED

On Fri, 27 Feb 2015 12:55:16 +0100
Valentin Rothberg <Valentin.Rothberg@...6.fr> wrote:

> The IRQF_DISABLED is a NOOP and scheduled to be removed.  According to
> Ingo Molnar (e58aa3d2d0cc01ad8d6f7f640a0670433f794922) running IRQ
> handlers with interrupts enabled can cause stack overflows when the
> interrupt line of the issuing device is still active.
> 
> This patch removes IRQF_DISABLED from this documentation.  It was
> mentioned to be a solution to avoid deadlocks when a device uses
> multiple interrupts.  As the flag is a NOOP this solution does not work
> anymore.

Seems good, applied to the docs tree.  I reworked the commit ID in the
changelog into the standard form (adding the one-line description),
though.

Thanks,

jon
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