From: Nitesh Lal <nilal@redhat.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Nitesh Narayan Lal <nitesh@redhat.com>,
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Subject: Re: [PATCH v1 14/14] net/mlx4: Use irq_update_affinity_hint
Date: Fri, 25 Jun 2021 17:08:03 -0400 [thread overview]
Message-ID: <CAFki+L=2nVA3FB03BjuXbj+di28LhVUzo9P9WoJyxoQFggt0VQ@mail.gmail.com> (raw)
In-Reply-To: <YNBHQvo1uDfBbr5c@unreal>
On Mon, Jun 21, 2021 at 4:02 AM Leon Romanovsky <leon@kernel.org> wrote:
>
> On Thu, Jun 17, 2021 at 02:22:42PM -0400, Nitesh Narayan Lal wrote:
> > The driver uses irq_set_affinity_hint() to update the affinity_hint mask
> > that is consumed by the userspace to distribute the interrupts. However,
> > under the hood irq_set_affinity_hint() also applies the provided cpumask
> > (if not NULL) as the affinity for the given interrupt which is an
> > undocumented side effect.
> >
> > To remove this side effect irq_set_affinity_hint() has been marked
> > as deprecated and new interfaces have been introduced. Hence, replace the
> > irq_set_affinity_hint() with the new interface irq_update_affinity_hint()
> > that only updates the affinity_hint pointer.
> >
> > Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> > ---
> > drivers/net/ethernet/mellanox/mlx4/eq.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
> > index 9e48509ed3b2..f549d697ca95 100644
> > --- a/drivers/net/ethernet/mellanox/mlx4/eq.c
> > +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
> > @@ -244,9 +244,9 @@ static void mlx4_set_eq_affinity_hint(struct mlx4_priv *priv, int vec)
> > cpumask_empty(eq->affinity_mask))
> > return;
> >
> > - hint_err = irq_set_affinity_hint(eq->irq, eq->affinity_mask);
> > + hint_err = irq_update_affinity_hint(eq->irq, eq->affinity_mask);
> > if (hint_err)
> > - mlx4_warn(dev, "irq_set_affinity_hint failed, err %d\n", hint_err);
> > + mlx4_warn(dev, "irq_update_affinity_hint failed, err %d\n", hint_err);
> > }
> > #endif
> >
> > @@ -1124,7 +1124,7 @@ static void mlx4_free_irqs(struct mlx4_dev *dev)
> > if (eq_table->eq[i].have_irq) {
> > free_cpumask_var(eq_table->eq[i].affinity_mask);
> > #if defined(CONFIG_SMP)
> > - irq_set_affinity_hint(eq_table->eq[i].irq, NULL);
> > + irq_update_affinity_hint(eq_table->eq[i].irq, NULL);
> > #endif
>
> This #if/endif can be deleted.
I think we also can get rid of the other #if/endif CONFIG_SMP
occurrences that are present around mlx4_set_eq_affinity_hint()
definition and call, isn't it?
There is already a check-in interrupt.h so doing it again in the
driver looks like an unwanted repetition IMHO.
>
> Thanks,
> Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
>
--
Thanks
Nitesh
prev parent reply other threads:[~2021-06-25 21:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 18:22 [PATCH v1 00/14] genirq: Cleanup the usage of irq_set_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal
2021-06-25 17:52 ` Nitesh Lal
2021-06-17 18:22 ` [PATCH v1 02/14] iavf: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 03/14] i40e: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-06-17 19:31 ` Robin Murphy
2021-06-17 19:34 ` Nitesh Lal
2021-06-17 18:22 ` [PATCH v1 05/14] scsi: mpt3sas: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 06/14] RDMA/i40iw: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 07/14] enic: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 08/14] be2net: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 09/14] ixgbe: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 10/14] mailbox: " Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 11/14] scsi: lpfc: Use irq_set_affinity Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 12/14] hinic: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-06-17 18:22 ` [PATCH v1 13/14] net/mlx5: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-06-21 8:01 ` Leon Romanovsky
2021-06-17 18:22 ` [PATCH v1 14/14] net/mlx4: " Nitesh Narayan Lal
2021-06-21 8:01 ` Leon Romanovsky
2021-06-21 12:59 ` Nitesh Lal
2021-06-25 21:08 ` Nitesh Lal [this message]
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