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

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Message-ID: <20170822163916.GA31671@lst.de>
Date:   Tue, 22 Aug 2017 18:39:16 +0200
From:   Christoph Hellwig <hch@....de>
To:     David Miller <davem@...emloft.net>
Cc:     hch@....de, 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

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.