From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 18C6ACCFA0D for ; Wed, 5 Nov 2025 21:08:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=i0IuDXeqMt1o/KgN3LLvCBk6fnKHY07Zt+5KogqjF0A=; b=Hhev3GgMAo9zd9jv1R6yRzuez5 SUpZWjXRrvuSlAm/vJOJOXIOZMoR0eVtvujnth1BHTDvVGhkIHA/PdwH3LSCax1UEzIgDQcpUrwbB GcuVqKuaAChIPXDT9g8GNtFW+PJ/HSYAHAbvrfVzFXIv3/+Z3zCo5uy0bRlOz8SVDe2QyHMqSxvQq n6ZGJlYxYGJzaSKngPlC1XFkHP+MtHrMdCSeaUxoXmAE6dzNxsqs/dxXbteBh0z7HegU67vWLLtjl oIxSsZJKCBPTwZcSqzdOi44HFtaqgsJPV/IiBVQvL0lPMTgVQHTnEe5A1eVn82Vu6ZwYGktmW/BsH uNsNNuMw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGkjZ-0000000ESR9-01sW; Wed, 05 Nov 2025 21:08:01 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGkjX-0000000ESPf-3Ny1 for linux-arm-kernel@lists.infradead.org; Wed, 05 Nov 2025 21:07:59 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 337DE601F1; Wed, 5 Nov 2025 21:07:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B1E3C116B1; Wed, 5 Nov 2025 21:07:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762376878; bh=VBowzwkKI7sQO6hRH/44BMa4PxA99ppD75DvlCpqKuI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HCxWOTZXSfmgLOy+8qHyUSsJQbRRrEggtHXYLIpXy1swuMrv2SEYUM8cLQW7kSc4H 0Ka2bto9uN0BXbhyNM3r1gLJVYwW3t2rKAXPeI6d3ZnnTZoRFUTmkBveHxO+F8uRmo AXkHlKN4LkLllSCXYkJiBOKHWrRf6CXXYtYu1l6M03U6EEvLzqrMyOOfnSaNsd0vRj h2TmHpzXfc20tUeNa2fzrHLlFE/ggaDYNk1I4h5CwebPAdOaP0ppHyvo465ef4OXCB CyfaCDTcbrZRKcEQW+8KvinCbmGda/odIiBswEOY/el7rbNcbJ1X/NP4oGu/CK60DH oTdnWeUTkDOGg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Danilo Krummrich , "David S . 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-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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