genirq: Always limit the affinity to online CPUs

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When booting with maxcpus=<small number> (or even loading a driver
while most CPUs are offline), it is pretty easy to observe managed
affinities containing a mix of online and offline CPUs being passed
to the irqchip driver.

This means that the irqchip cannot trust the affinity passed down
from the core code, which is a bit annoying and requires (at least
in theory) all drivers to implement some sort of affinity narrowing.

In order to address this, always limit the cpumask to the set of
online CPUs.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220405185040.206297-3-maz@kernel.org

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Marc Zyngier 2022-04-05 19:50:39 +01:00 • committed by Thomas Gleixner

parent d802057c7c

commit 33de0aa4ba

1 changed files with 17 additions and 8 deletions

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kernel/irq/manage.c

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