linux-kernel - [PATCH v4 0/2] PCI: hv: Refactor hv_irq_unmask() to use hv_vpset and cpumask_to

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Date:   Thu, 28 Feb 2019 02:32:00 +0000
From:   Maya Nakamura <m.maya.nakamura@...il.com>
To:     lorenzo.pieralisi@....com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, kys@...rosoft.com,
        sthemmin@...rosoft.com, olaf@...fle.de, apw@...onical.com,
        jasowang@...hat.com, mikelley@...rosoft.com,
        Alexander.Levin@...rosoft.com
Cc:     linux-kernel@...r.kernel.org, haiyangz@...rosoft.com,
        vkuznets@...hat.com, marcelo.cerri@...onical.com,
        linux-hyperv@...r.kernel.org
Subject: [PATCH v4 0/2] PCI: hv: Refactor hv_irq_unmask() to use hv_vpset and
 cpumask_to_vpset()

This patchset removes a duplicate definition of VP set (hv_vp_set) and
uses the common definition (hv_vpset) that is used in other places. It
changes the order of the members in struct hv_pcibus_device due to
flexible array in hv_vpset.

It also removes the duplicate implementation of cpumask_to_vpset(), uses
the shared implementation, and exports hv_max_vp_index, which is
required by cpumask_to_vpset().

Based on Vitaly's findings, two changes were applied: replace GFP_KERNEL
with GFP_ATOMIC for alloc_cpumask_var() because hv_irq_unmask() runs
while a spinlock is held, and add __aligned(8) to struct
retarget_msi_interrupt because Hyper-V requires that hypercall arguments
be aligned on an 8 byte boundary.

Vitaly, thank you for finding the issues, and Lorenzo and Michael, thank
you for your guidance and support!

Maya Nakamura (2):
  PCI: hv: Replace hv_vp_set with hv_vpset
  PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()

 arch/x86/hyperv/hv_init.c           |  1 +
 drivers/pci/controller/pci-hyperv.c | 61 +++++++++++++----------------
 2 files changed, 29 insertions(+), 33 deletions(-)

-- 
2.17.1