"git log --oneline drivers/pci/pci-driver.c" tells you that the
subject should be something like:
PCI: Restrict probe functions to housekeeping CPUs
On Wed, Jun 10, 2020 at 12:12:25PM -0400, Nitesh Narayan Lal wrote:
> From: Alex Belits <abelits@xxxxxxxxxxx>
>
> pci_call_probe() prevents the nesting of work_on_cpu()
> for a scenario where a VF device is probed from work_on_cpu()
> of the Physical device.
> This patch replaces the cpumask used in pci_call_probe()
> from all online CPUs to only housekeeping CPUs. This is to
> ensure that there are no additional latency overheads
> caused due to the pinning of jobs on isolated CPUs.
s/Physical/PF/ (since you used "VF" earlier, this should match that)
s/This patch replaces/Replace the/
Please rewrap this to fill a 75 column line (so it doesn't overflow 80
columns when "git log" adds 4 spaces).
This should be two paragraphs; add a blank line between them.
> Signed-off-by: Alex Belits <abelits@xxxxxxxxxxx>
> Signed-off-by: Nitesh Narayan Lal <nitesh@xxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> ---
> drivers/pci/pci-driver.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index da6510af1221..449466f71040 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -12,6 +12,7 @@
> #include <linux/string.h>
> #include <linux/slab.h>
> #include <linux/sched.h>
> +#include <linux/sched/isolation.h>
> #include <linux/cpu.h>
> #include <linux/pm_runtime.h>
> #include <linux/suspend.h>
> @@ -333,6 +334,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
> const struct pci_device_id *id)
> {
> int error, node, cpu;
> + int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
> struct drv_dev_and_id ddi = { drv, dev, id };
>
> /*
> @@ -353,7 +355,8 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
> pci_physfn_is_probed(dev))
> cpu = nr_cpu_ids;
> else
> - cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
> + cpu = cpumask_any_and(cpumask_of_node(node),
> + housekeeping_cpumask(hk_flags));
>
> if (cpu < nr_cpu_ids)
> error = work_on_cpu(cpu, local_pci_probe, &ddi);
> --
> 2.18.4
>
