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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: Thu, 1 Jan 2026 23:13:57 +0100 Message-ID: <20260101221359.22298-33-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: k5w7guiyx7jjoz4iqz5eo3bwyaoixsfh X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: D8C16180003 X-HE-Tag: 1767305917-90941 X-HE-Meta: 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 6OCSq+Xa 6ncNDJRjSAi+fX2uzXFv1BaN1VldFlO+eYBqKSrZzCibImmmBWtLRcZ+Q+lGCTJP/R6q36gqBHKFlyBGgudd7EN4llM83nzVgfqkujWDMrDMQfoHn7h31DshhgrZ5z3SkiWCaaHz9ZwPtOqFhZraYdeKi1ZZ4Z/a6arp2jgWFhx3Qmx7cUgXaLHKQTDrCFQnBeky+HuEd0QVaRt+tZEPMXAxBGEDlgv3q/ODlCH/4Wh+2X8EHnqSiGIfx708KBKlU+to9emOxpqq3PWMh0yT9IEh9lSz0++0lGDxfT3eVJEXEr5bgqBhRmqdhqrtVkpL5XIQV 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