netdev - Re: [PATCH tip:irq/core v1] genirq: remove auto-set of the mask when setting the hint

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Message-ID: <87sg2lz0zz.ffs@nanos.tec.linutronix.de>
Date:   Mon, 17 May 2021 20:08:48 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Robin Murphy <robin.murphy@....com>, Nitesh Lal <nilal@...hat.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "frederic\@kernel.org" <frederic@...nel.org>,
        "juri.lelli\@redhat.com" <juri.lelli@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, jbrandeb@...nel.org,
        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>,
        "akpm\@linux-foundation.org" <akpm@...ux-foundation.org>,
        "sfr\@canb.auug.org.au" <sfr@...b.auug.org.au>,
        "stephen\@networkplumber.org" <stephen@...workplumber.org>,
        "rppt\@linux.vnet.ibm.com" <rppt@...ux.vnet.ibm.com>,
        "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>
Subject: Re: [PATCH tip:irq/core v1] genirq: remove auto-set of the mask when setting the hint

On Mon, May 17 2021 at 18:26, Robin Murphy wrote:
> On 2021-05-17 17:57, Nitesh Lal wrote:
> I'm not implying that there isn't a bug, or that this code ever made 
> sense in the first place, just that fixing it will unfortunately be a 
> bit more involved than a simple revert. This patch as-is *will* subtly 
> break at least the system PMU drivers currently using

s/using/abusing/

> irq_set_affinity_hint() - those I know require the IRQ affinity to 
> follow whichever CPU the PMU context is bound to, in order to meet perf 
> core's assumptions about mutual exclusion.

Which driver is that?

Thanks,

        tglx