linux-kernel - [PATCH 31/33] kthread: Document kthread_affine

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Message-ID: <20251013203146.10162-32-frederic@kernel.org>
Date: Mon, 13 Oct 2025 22:31:44 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.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>,
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	Gabriele Monaco <gmonaco@...hat.com>,
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	Ingo Molnar <mingo@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
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	Michal Hocko <mhocko@...e.com>,
	Muchun Song <muchun.song@...ux.dev>,
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	Phil Auld <pauld@...hat.com>,
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Subject: [PATCH 31/33] kthread: Document kthread_affine_preferred()

The documentation of this new API has been overlooked during its
introduction. Fill the gap.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/kthread.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index f3397cf7542a..b989aeaa441a 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -857,6 +857,18 @@ int kthreadd(void *unused)
 	return 0;
 }
 
+/**
+ * kthread_affine_preferred - Define a kthread's preferred affinity
+ * @p: thread created by kthread_create().
+ * @cpumask: preferred mask of CPUs (might not be online, must be possible) for @k
+ *           to run on.
+ *
+ * Similar to kthread_bind_mask() except that the affinity is not a requirement
+ * but rather a preference that can be constrained by CPU isolation or CPU hotplug.
+ * Must be called before the first wakeup of the kthread.
+ *
+ * Returns 0 if the affinity has been applied.
+ */
 int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask)
 {
 	struct kthread *kthread = to_kthread(p);
-- 
2.51.0