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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180313232440.GA28358@localhost.localdomain \
--to=keith.busch@intel.com \
--cc=bhelgaas@google.com \
--cc=jonathan.derrick@intel.com \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=scott.bauer@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.