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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 30/31] kthread: Document kthread_affine_preferred() Date: Wed, 5 Nov 2025 22:03:46 +0100 Message-ID: <20251105210348.35256-31-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251105210348.35256-1-frederic@kernel.org> References: <20251105210348.35256-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A686F40014 X-Stat-Signature: a6r3xzbhh754ftc5qq5q1qyqj4yfh5a3 X-Rspam-User: X-HE-Tag: 1762376879-275776 X-HE-Meta: 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 NyOve3kD zraT3aZQBRL3VGFwIFQ2K3Xkjj7E3gAOPHcDgOsN1QGYJHZg= 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 e38ff9b943cf..4d0d5dccc9d8 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -858,6 +858,18 @@ 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); -- 2.51.0