> -----Original Message----- > From: devel [mailto:driverdev-devel-bounces@xxxxxxxxxxxxxxxxxxxxxx] On > Behalf Of kys@xxxxxxxxxxxxxxxxxxxxxx > Sent: Friday, March 24, 2017 11:07 AM > To: helgaas@xxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; > apw@xxxxxxxxxxxxx; vkuznets@xxxxxxxxxx; jasowang@xxxxxxxxxx; > leann.ogasawara@xxxxxxxxxxxxx; marcelo.cerri@xxxxxxxxxxxxx; Stephen > Hemminger <sthemmin@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Subject: [PATCH 1/2] pci-hyperv: Fix a bug in specifying CPU affinity > > From: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > > When we have 32 or more CPUs in the affinity mask, we should use a special > constant to specify that to the host. Fix this issue. > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> Reviewed-by: Long Li <longli@xxxxxxxxxxxxx> > --- > drivers/pci/host/pci-hyperv.c | 11 ++++++++--- > 1 files changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c > index ada9856..32a16fb 100644 > --- a/drivers/pci/host/pci-hyperv.c > +++ b/drivers/pci/host/pci-hyperv.c > @@ -72,6 +72,7 @@ enum { > PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1 }; > > +#define CPU_AFFINITY_ALL -1ULL > #define PCI_CONFIG_MMIO_LENGTH 0x2000 > #define CFG_PAGE_OFFSET 0x1000 > #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - > CFG_PAGE_OFFSET) @@ -897,9 +898,13 @@ static void > hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) > * processors because Hyper-V only supports 64 in a guest. > */ > affinity = irq_data_get_affinity_mask(data); > - for_each_cpu_and(cpu, affinity, cpu_online_mask) { > - int_pkt->int_desc.cpu_mask |= > - (1ULL << vmbus_cpu_number_to_vp_number(cpu)); > + if (cpumask_weight(affinity) >= 32) { > + int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL; > + } else { > + for_each_cpu_and(cpu, affinity, cpu_online_mask) { > + int_pkt->int_desc.cpu_mask |= > + (1ULL << vmbus_cpu_number_to_vp_number(cpu)); > + } > } > > ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, > -- > 1.7.1 > > _______________________________________________ > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxx > http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
