linux-kernel - Re: [PATCH 30/33] kthread: Add API to update preferred affinity on kthread runtime

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Message-ID: <aO5Dn2AwQWn0SQKQ@horms.kernel.org>
Date: Tue, 14 Oct 2025 13:35:43 +0100
From: Simon Horman <horms@...nel.org>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Michal Koutný <mkoutny@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Danilo Krummrich <dakr@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
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	Lai Jiangshan <jiangshanlai@...il.com>,
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	Michal Hocko <mhocko@...e.com>, Muchun Song <muchun.song@...ux.dev>,
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	Vlastimil Babka <vbabka@...e.cz>, Waiman Long <longman@...hat.com>,
	Will Deacon <will@...nel.org>, cgroups@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-block@...r.kernel.org,
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	netdev@...r.kernel.org
Subject: Re: [PATCH 30/33] kthread: Add API to update preferred affinity on
 kthread runtime

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)

...