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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: Sun, 25 Jan 2026 23:45:39 +0100 Message-ID: <20260125224541.50226-33-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260125224541.50226-1-frederic@kernel.org> References: <20260125224541.50226-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: DA30A140005 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: w8pisknduirqhxuohp6a3hsi6g56yec7 X-HE-Tag: 1769381413-613518 X-HE-Meta: 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 ln+CBrKZ 1cG6Ff7gHbDBVNdIo4XEQw+8BE/xOWxzBHe9BOxSJ0m5l+HcONnTkBnlfi+XA9OB2t+ayZ8/JPF8l05TJpu/ttjntIhTbzcBrN6efo5zt3dv91uAdFuapfpnSw3hoJFfA1U0PPA9Peh8pvqMzy6U85cmBz3wOeD+IvNqX0n/Kiqz4TV5y7w/yMBwLDskL3do0qp4vDdDpvjtw7oQ3Tm+hL+54GdBYOI1d1MdjtPXzmr0vT28q6Kmt3WozXhHAoSL4LsZazpx2MCD24vddhJQokLUlIVL2f7da62UoWqaq87LPfTIOqrQ0/pf08jEqs0rf3Rib 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