linux-kernel - Re: PCI: MSI interrupts masked using prohibited method

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Message-ID: <20080723150222.4de1775c@brian.englab.brq.redhat.com>
Date:	Wed, 23 Jul 2008 15:02:22 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	David Vrabel <david.vrabel@....com>,
	Matthew Wilcox <matthew@....cx>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: PCI: MSI interrupts masked using prohibited method

On Tue, 22 Jul 2008 10:52:26 -0700
Jesse Barnes <jbarnes@...tuousgeek.org> wrote:

> On Tuesday, July 22, 2008 6:56 am Michal Schmidt wrote:
> > This breaks the setting of SMP affinity for MSI interrupts :-(
> > With the patch, writes to /proc/irq/<n>/smp_affinity are ignored
> > for an MSI interrupt.
> 
> It should only break it for devices that don't provide a mask bit.

Yes, smp_affinity works for devices with a mask bit.

> But given that we can't really mask generically on those devices,
> maybe that's ok given that it fixes the other problems mentioned in
> this thread...

Does it mean there is no way IRQ migration could work reliably for
devices without a mask bit?

Michal
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