linux-kernel - Re: [PATCH] genirq: Provide new interfaces for affinity hints

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Date:   Fri, 21 May 2021 23:48:43 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nitesh Lal <nilal@...hat.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, jbrandeb@...nel.org,
        "frederic\@kernel.org" <frederic@...nel.org>,
        "juri.lelli\@redhat.com" <juri.lelli@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        "linux-api\@vger.kernel.org" <linux-api@...r.kernel.org>,
        "bhelgaas\@google.com" <bhelgaas@...gle.com>,
        "linux-pci\@vger.kernel.org" <linux-pci@...r.kernel.org>,
        "rostedt\@goodmis.org" <rostedt@...dmis.org>,
        "peterz\@infradead.org" <peterz@...radead.org>,
        "davem\@davemloft.net" <davem@...emloft.net>,
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        "stephen\@networkplumber.org" <stephen@...workplumber.org>,
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        "jinyuqi\@huawei.com" <jinyuqi@...wei.com>,
        "zhangshaokun\@hisilicon.com" <zhangshaokun@...ilicon.com>,
        netdev@...r.kernel.org, chris.friesen@...driver.com,
        Marc Zyngier <maz@...nel.org>,
        Neil Horman <nhorman@...driver.com>, pjwaskiewicz@...il.com
Subject: Re: [PATCH] genirq: Provide new interfaces for affinity hints

On Fri, May 21 2021 at 12:13, Nitesh Lal wrote:
> On Fri, May 21, 2021 at 8:03 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>> Provide new interfaces:
>>
>>   irq_update_affinity_hint() - Only sets the affinity hint pointer
>>   irq_apply_affinity_hint()  - Set the pointer and apply the affinity to
>>                                the interrupt
>>
>
> Any reason why you ruled out the usage of irq_set_affinity_and_hint()?
> IMHO the latter makes it very clear what the function is meant to do.

You're right. I was trying to phase the existing hint setter out, but
that's probably pointless overengineering for no real value. Let me redo
that.

Thanks,

        tglx