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From: Jakub Kicinski <kuba@kernel.org>
To: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
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Subject: Re: [PATCH v4 01/14] genirq: Provide new interfaces for affinity hints
Date: Tue, 20 Jul 2021 12:57:02 +0200	[thread overview]
Message-ID: <20210720125702.28053dd6@cakuba> (raw)
In-Reply-To: <20210719180746.1008665-2-nitesh@redhat.com>

On Mon, 19 Jul 2021 14:07:33 -0400, Nitesh Narayan Lal wrote:
> From: Thomas Gleixner <tglx@linutronix.de>
> 
> The discussion about removing the side effect of irq_set_affinity_hint() of
> actually applying the cpumask (if not NULL) as affinity to the interrupt,
> unearthed a few unpleasantries:
> 
>   1) The modular perf drivers rely on the current behaviour for the very
>      wrong reasons.
> 
>   2) While none of the other drivers prevents user space from changing
>      the affinity, a cursorily inspection shows that there are at least
>      expectations in some drivers.
> 
> #1 needs to be cleaned up anyway, so that's not a problem
> 
> #2 might result in subtle regressions especially when irqbalanced (which
>    nowadays ignores the affinity hint) is disabled.
> 
> Provide new interfaces:
> 
>   irq_update_affinity_hint()  - Only sets the affinity hint pointer
>   irq_set_affinity_and_hint() - Set the pointer and apply the affinity to
>                                 the interrupt
> 
> Make irq_set_affinity_hint() a wrapper around irq_apply_affinity_hint() and
> document it to be phased out.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> Link: https://lore.kernel.org/r/20210501021832.743094-1-jesse.brandeburg@intel.com

include/linux/interrupt.h:343: warning: Function parameter or member 'm' not described in 'irq_update_affinity_hint'
include/linux/interrupt.h:343: warning: Excess function parameter 'cpumask' description in 'irq_update_affinity_hint'
include/linux/interrupt.h:358: warning: Function parameter or member 'm' not described in 'irq_set_affinity_and_hint'
include/linux/interrupt.h:358: warning: Excess function parameter 'cpumask' description in 'irq_set_affinity_and_hint'

  reply	other threads:[~2021-07-20 11:01 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 18:07 [PATCH v4 00/14] genirq: Cleanup the usage of irq_set_affinity_hint Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal
2021-07-20 10:57   ` Jakub Kicinski [this message]
2021-07-19 18:07 ` [PATCH v4 02/14] iavf: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 03/14] i40e: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 05/14] scsi: mpt3sas: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 06/14] RDMA/irdma: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 07/14] enic: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 08/14] be2net: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 09/14] ixgbe: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 10/14] mailbox: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 11/14] scsi: lpfc: Use irq_set_affinity Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 12/14] hinic: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 13/14] net/mlx5: " Nitesh Narayan Lal
2021-07-19 18:07 ` [PATCH v4 14/14] net/mlx4: Use irq_update_affinity_hint Nitesh Narayan Lal

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