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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, 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: [PATCH 32/33] kthread: Document kthread_affine_preferred() Date: Wed, 24 Dec 2025 14:45:19 +0100 Message-ID: <20251224134520.33231-33-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: bbgot8sttabwzhy874et4upi5mxg9st7 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6DF34A0002 X-HE-Tag: 1766584206-348948 X-HE-Meta: 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 s9tPrUPW 55cg2e+3Vu8/C3o7LulQyC1HjXOWRTgqBClGpG8LX1Tqx6iH6K4dC+Q/P2Fbn4l3sbjFv0cAjXVxPPgxrY8JDHRSND5Qg06zsDRCwuGcTZ7VxgzLH3uWwNtlVhA/TS5eFK2IFUG7mFHsVm3Omrbdpd78362GEtKH5kiCBFu6Q7vz5Xpn+A1156AuWtImKWd5GYbH1bW0yTBXMAXleQJgxT9EAUfKEmK4X5slaCEub7+Cz8sAnfpxBS2IQGYzLvcrOFyOAnoaJelD6GEjbWL4JuHYW9u1ECYk5LH7c8sB6Spm2f9kSjhxVfnSLywmz0t1+njjm X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The documentation of this new API has been overlooked during its introduction. Fill the gap. Signed-off-by: Frederic Weisbecker --- kernel/kthread.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/kthread.c b/kernel/kthread.c index 51f419139dea..c50f4c0eabfe 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -856,6 +856,18 @@ int kthreadd(void *unused) return 0; } +/** + * kthread_affine_preferred - Define a kthread's preferred affinity + * @p: thread created by kthread_create(). + * @mask: preferred mask of CPUs (might not be online, must be possible) for @p + * 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); -- 2.51.1