linux-kernel - Re: [PATCH v5 04/14] scsi: megaraid_sas: Use irq_set_affinity_and

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Date:   Fri, 6 Aug 2021 17:01:17 +0530
From:   Sumit Saxena <sumit.saxena@...adcom.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux SCSI List <linux-scsi@...r.kernel.org>,
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Subject: Re: [PATCH v5 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint

On Wed, Jul 21, 2021 at 4:57 AM Nitesh Narayan Lal <nitesh@...hat.com> wrote:
>
> The driver uses irq_set_affinity_hint() specifically for the high IOPS
> queue interrupts for two purposes:
>
> - To set the affinity_hint which is consumed by the userspace for
>   distributing the interrupts
>
> - To apply an affinity that it provides
>
> The driver enforces its own affinity to bind the high IOPS queue interrupts
> to the local NUMA node. However, irq_set_affinity_hint() applying the
> provided cpumask as an affinity for the interrupt 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_set_affinity_and_hint()
> where the provided mask needs to be applied as the affinity and
> affinity_hint pointer needs to be set and replace with
> irq_update_affinity_hint() where only affinity_hint needs to be updated.
>
> Change the megasas_set_high_iops_queue_affinity_hint function name to
> megasas_set_high_iops_queue_affinity_and_hint to clearly indicate that the
> function is setting both affinity and affinity_hint.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
Looks good.
Acked-by: Sumit Saxena <sumit.saxena@...adcom.com>

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