linux-kernel - Re: 4.13.0-rc4 sparc64: can't allocate MSI-X affinity masks for 2 vectors

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Message-Id: <20170822.093139.473720171751670244.davem@davemloft.net>
Date:   Tue, 22 Aug 2017 09:31:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hch@....de
Cc:     mroos@...ux.ee, helgaas@...nel.org, sparclinux@...r.kernel.org,
        linux-pci@...r.kernel.org, qla2xxx-upstream@...gic.com,
        linux-kernel@...r.kernel.org
Subject: Re: 4.13.0-rc4 sparc64: can't allocate MSI-X affinity masks for 2
 vectors

From: Christoph Hellwig <hch@....de>
Date: Tue, 22 Aug 2017 08:35:05 +0200

> On Mon, Aug 21, 2017 at 01:35:49PM -0700, David Miller wrote:
>> I ask because the commit log message indicates that this failure is
>> not expected to ever happen on SMP.
> 
> I fear my commit message (but not the code) might be wrong.
> irq_create_affinity_masks can return NULL any time we don't have any
> affinity masks.  I've already had a discussion about this elsewhere
> with Bjorn, and I suspect we need to kill the warning or move it
> to irq_create_affinity_masks only for genuine failure cases.

This is a rather large machine with 64 or more cpus and several NUMA
nodes.  Why wouldn't there be any affinity masks available?

That's why I want to root cause this.