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From: Jonathan Corbet <corbet@lwn.net>
To: Valentin Rothberg <Valentin.Rothberg@lip6.fr>
Cc: bhelgaas@google.com, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] MSI-HOWTO.txt: remove reference on IRQF_DISABLED
Date: Fri, 27 Feb 2015 15:17:07 -0700	[thread overview]
Message-ID: <20150227151707.3bf64000@lwn.net> (raw)
In-Reply-To: <1425038116-19227-1-git-send-email-Valentin.Rothberg@lip6.fr>

On Fri, 27 Feb 2015 12:55:16 +0100
Valentin Rothberg <Valentin.Rothberg@lip6.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

  reply	other threads:[~2015-02-27 22:17 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-27 11:55 Valentin Rothberg
2015-02-27 22:17 ` Jonathan Corbet [this message]
2015-02-27 22:22   ` Valentin Rothberg

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