linux-kernel - Re: [PATCH v5 11/14] scsi: lpfc: Use irq_set

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Date:   Fri, 23 Jul 2021 10:15:12 -0700
From:   James Smart <jsmart2021@...il.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
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Subject: Re: [PATCH v5 11/14] scsi: lpfc: Use irq_set_affinity

On 7/20/2021 4:26 PM, Nitesh Narayan Lal wrote:
> The driver uses irq_set_affinity_hint to set the affinity for the lpfc
> interrupts to a mask corresponding to the local NUMA node to avoid
> performance overhead on AMD architectures.
> 
> However, irq_set_affinity_hint() setting the affinity is an undocumented
> side effect that this function also sets the affinity under the hood.
> To remove this side effect irq_set_affinity_hint() has been marked as
> deprecated and new interfaces have been introduced.
> 
> Also, as per the commit dcaa21367938 ("scsi: lpfc: Change default IRQ model
> on AMD architectures"):
> "On AMD architecture, revert the irq allocation to the normal style
> (non-managed) and then use irq_set_affinity_hint() to set the cpu affinity
> and disable user-space rebalancing."
> we don't really need to set the affinity_hint as user-space rebalancing for
> the lpfc interrupts is not desired.
> 
> Hence, replace the irq_set_affinity_hint() with irq_set_affinity() which
> only applies the affinity for the interrupts.
> 
> Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
> ---
>   drivers/scsi/lpfc/lpfc_init.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 

Looks good. Thanks

Reviewed-by: James Smart <jsmart2021@...il.com>

-- james