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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 31/33] kthread: Document kthread_affine_preferred() Date: Mon, 13 Oct 2025 22:31:44 +0200 Message-ID: <20251013203146.10162-32-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 4EE7518000A X-Rspamd-Server: rspam02 X-Stat-Signature: ob74fkt5yr7jy46fy9uyuowiewuox7bk X-HE-Tag: 1760387758-640339 X-HE-Meta: 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 Gms5XHFn 7nG0lyVzRBsotw9sjyAiTlCnr4qWz4OjhpzMCcaxmUTp5iQ9gBNsHEGfNL9LJTxwJxr6yq4W+MYJEgvScmQZOV0xXbWvLWKnb8bnbljdEayLQi2ZMFFYXVB/y9wkPO6IHqHJIgJa69grQayKXUUOlB714yz+/jgrHE8MdeVUFlJBXni7C7Kh23VIg+0orMlf8AB9Xe5UoBPD1pVY6nVVyAmNSI/x6Ga6vbSEG3cTrYGAHoag1MoucBPwaU/f8XtRAHVER800Gb6epg+y7mvlBc87Guk1A5Cxz+nfg0AbC4tLQfbFCdlNkcCl1lJACztC7ObJM 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 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