linux-kernel - Question on armv7-pmu interrupt-affinity property

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Message-ID: <20220831173944.GB147052@francesco-nb.int.toradex.com>
Date:   Wed, 31 Aug 2022 19:39:44 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     NXP Linux Team <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Question on armv7-pmu interrupt-affinity property

Hello all,
I am getting this warning from the kernel

[    1.488888] armv7-pmu pmu: hw perfevents: no interrupt-affinity property, guessing.

on two different i.MX6 boards (apalis-imx6 and colibri-imx6).

>From my (very limited) understanding we should have the
"interrupt-affinity" property set in the SOC dtsi file, but this is not
the case for imx6qdl.dtsi.

1. Is my understanding correct?
2. What's the functional drawback of this property missing? Given the warning
   level of the printk I would expect some kind of malfunction.

thanks!
Francesco