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Date: Tue, 14 Oct 2025 13:35:43 +0100
From: Simon Horman <horms@kernel.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Michal =?utf-8?Q?Koutn=C3=BD?= <mkoutny@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Danilo Krummrich <dakr@kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Gabriele Monaco <gmonaco@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Ingo Molnar <mingo@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Johannes Weiner <hannes@cmpxchg.org>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Marco Crivellari <marco.crivellari@suse.com>,
	Michal Hocko <mhocko@suse.com>, Muchun Song <muchun.song@linux.dev>,
	Paolo Abeni <pabeni@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>, Phil Auld <pauld@redhat.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Roman Gushchin <roman.gushchin@linux.dev>,
	Shakeel Butt <shakeel.butt@linux.dev>, Tejun Heo <tj@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>, Waiman Long <longman@redhat.com>,
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	linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org,
	linux-mm@kvack.org, linux-pci@vger.kernel.org,
	netdev@vger.kernel.org
Subject: Re: [PATCH 30/33] kthread: Add API to update preferred affinity on
 kthread runtime
Message-ID: <aO5Dn2AwQWn0SQKQ@horms.kernel.org>
References: <20251013203146.10162-1-frederic@kernel.org>
 <20251013203146.10162-31-frederic@kernel.org>
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In-Reply-To: <20251013203146.10162-31-frederic@kernel.org>

On Mon, Oct 13, 2025 at 10:31:43PM +0200, Frederic Weisbecker wrote:

...

> @@ -900,6 +899,46 @@ int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask)
>  }
>  EXPORT_SYMBOL_GPL(kthread_affine_preferred);
>  
> +/**
> + * kthread_affine_preferred_update - update a kthread's preferred affinity
> + * @p: thread created by kthread_create().
> + * @cpumask: new mask of CPUs (might not be online, must be possible) for @k
> + *           to run on.

nit: @mask: ...

Likewise for the documentation of kthread_affine_preferred()
in a subsequent patch in this series.

> + *
> + * Update the cpumask of the desired kthread's affinity that was passed by
> + * a previous call to kthread_affine_preferred(). This can be called either
> + * before or after the first wakeup of the kthread.
> + *
> + * Returns 0 if the affinity has been applied.
> + */
> +int kthread_affine_preferred_update(struct task_struct *p,
> +				    const struct cpumask *mask)

...