linux-kernel - Re: [PATCH 1/2] genirq: Fix IRQ threads affinity VS cpuset isolated partitions

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Message-ID: <87h5urmez6.ffs@tglx>
Date: Tue, 18 Nov 2025 18:23:57 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Waiman Long <llong@...hat.com>, Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Marco Crivellari
 <marco.crivellari@...e.com>, Waiman Long <llong@...hat.com>,
 cgroups@...r.kernel.org
Subject: Re: [PATCH 1/2] genirq: Fix IRQ threads affinity VS cpuset isolated
 partitions

On Tue, Nov 18 2025 at 11:27, Waiman Long wrote:
>> +static inline void irq_thread_set_affinity(struct task_struct *t,
>> +					   struct irq_desc *desc)
>> +{
>> +	kthread_bind_mask(t, irq_data_get_effective_affinity_mask(&desc->irq_data));
>> +}
>
> According to irq_thread_check_affinity(), accessing the cpumask returned 
> from irq_data_get_effective_affinity_mask(&desc->irq_data) requires 
> taking desc->lock to ensure its stability. Do we need something similar 
> here? Other than that, it looks good to me.

That's during interrupt setup so it should be stable (famous last words)