From: Keith Busch <keith.busch@intel.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Linux PCI <linux-pci@vger.kernel.org>,
Jonathan Derrick <jonathan.derrick@intel.com>,
Scott Bauer <scott.bauer@intel.com>
Subject: Re: [PATCHv2] PCI: vmd: Use affinity to chain child device interrupts
Date: Tue, 13 Mar 2018 17:24:40 -0600 [thread overview]
Message-ID: <20180313232440.GA28358@localhost.localdomain> (raw)
In-Reply-To: <20180313201807.GA28112@localhost.localdomain>
On Tue, Mar 13, 2018 at 02:18:07PM -0600, Keith Busch wrote:
>
> And since you brought my attention to it, I see the 'if' is off by one.
> Let me prepare a v3, and I've one other minor optimization to add as
> well.
Ugh, I may need to request withdrawing this patch entirely. This will
completely break if the VMD interrupt vector's SMP affinity is a subset
of the child driver's, and the CPUs in the intersection of those masks
are set offline after driver initialization.
That's looking like a pretty tricky problem to fix, all for (somewhat)
obscure kernel feature... I can't see how without a new hot cpu notifier.
Let me request a pause on this one and I'll get back ASAP.
next prev parent reply other threads:[~2018-03-13 23:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-06 20:22 [PATCHv2] PCI: vmd: Use affinity to chain child device interrupts Keith Busch
2018-03-13 17:10 ` Lorenzo Pieralisi
2018-03-13 20:08 ` Keith Busch
2018-03-13 20:18 ` Keith Busch
2018-03-13 23:24 ` Keith Busch [this message]
2018-03-14 11:05 ` Lorenzo Pieralisi
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