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

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Date:   Tue, 22 Aug 2017 09:52:09 -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 18:39:16 +0200

> On Tue, Aug 22, 2017 at 09:31:39AM -0700, David Miller wrote:
>> > 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?
> 
> The drivers only asked for two MSI-X vectors, and marked bost of them
> as pre-vectors that should not be spread.  So there is no actual
> vector left that we want to actually spread.

Ok, now it makes more sense, and yes the warning should be removed.