From nobody Tue Feb 10 01:31:47 2026 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 60CD37263B; Thu, 25 Dec 2025 12:45:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766666757; cv=none; b=E4sN260g7rwkuS4JFfjFzHJHe7r4ySRdTbtfjEDhgxUjismyXWo0oy94fedtkrbImgiagK6u5vGVER7GWR+OZxNGZuXx2iP3gieNaRprz3dZrXhSZ7Yt1cFqYNwoCvl8cooQrnr5NoXcBlZ+2OoCo6odimBafsAOPDzD6DiF+oo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766666757; c=relaxed/simple; bh=0T9kISK2w8BIvPD5DMPZ+zWF1jhhxroUrxQ3iqUGseA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MK601ZktSBvyuW9iYwjhcCw2dPZ8I8M+XYbfdMXVT0to165A9hIB5hZzEv+u3KZWocOQY5iwULFpIXqRndiK3gNHJ9+/nAj5ztILbHi2gepsxBCTIO6mFlOR7qhboTKBGJAS+vnOe1nFJ2Jm4WKOoX2D7c56ej1lVce45reVop8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.198]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dcT3p64yGzYQv0M; Thu, 25 Dec 2025 20:45:10 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 2EC4440579; Thu, 25 Dec 2025 20:45:51 +0800 (CST) Received: from hulk-vt.huawei.com (unknown [10.67.174.121]) by APP4 (Coremail) with SMTP id gCh0CgDHdfb1MU1pT76_BQ--.27441S6; Thu, 25 Dec 2025 20:45:51 +0800 (CST) From: Chen Ridong To: longman@redhat.com, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, lujialin4@huawei.com, chenridong@huaweicloud.com Subject: [PATCH RESEND -next 04/21] cpuset: introduce partition_disable() Date: Thu, 25 Dec 2025 12:30:41 +0000 Message-Id: <20251225123058.231765-5-chenridong@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251225123058.231765-1-chenridong@huaweicloud.com> References: <20251225123058.231765-1-chenridong@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgDHdfb1MU1pT76_BQ--.27441S6 X-Coremail-Antispam: 1UD129KBjvJXoW7CryUtryUuF13Zr1kJF4fXwb_yoW8Kw43pF 1DCr43t3yYgr13u3sxJan7uw1rKa1kXFW7tw17Xw1rXFy7Aa4qva4vk39Iv3WUXFyDW345 ZFsIqr4xWF17A3JanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPj14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY1x0262kKe7AKxVWUAV WUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v2 6r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2 Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_ Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMI IF0xvEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIevJa73UjIFyTuYvjfUYcTQUUUU U X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ Content-Type: text/plain; charset="utf-8" From: Chen Ridong Add partition_disable() to consolidate updates to key cpuset structures during partition disablement, including: 1. remote_partition 2. effective_xcpus 3. partition_root_state 4. prs_err Key operations performed: 1. Cleaning up remote_partition 2. Removing exclusive CPUs via partition_xcpus_del() 3. Recomputing effective exclusive CPUs mask 4. Updating partition state and error status 5. Triggering required scheduler domain rebuilds 6. Clear exclusive flag. 7. Sends partition change notifications Signed-off-by: Chen Ridong --- kernel/cgroup/cpuset.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index dbcb5e4d1f2c..d1bf1a2f6acd 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1525,6 +1525,39 @@ static void partition_enable(struct cpuset *cs, stru= ct cpuset *parent, notify_partition_change(cs, old_prs); } =20 +/** + * partition_disable - Disable partition root state for a cpuset + * @cs: The cpuset to disable partition for + * @parent: Parent cpuset of @cs, NULL for remote parent + * @new_prs: New partition root state (should be non-positive) + * @prs_err: Error code to set if disabling due to validation failure + */ +static void partition_disable(struct cpuset *cs, struct cpuset *parent, + int new_prs, enum prs_errcode prs_err) +{ + int old_prs; + + lockdep_assert_held(&cpuset_mutex); + WARN_ON_ONCE(new_prs > 0); + WARN_ON_ONCE(!cpuset_v2()); + + old_prs =3D cs->partition_root_state; + spin_lock_irq(&callback_lock); + cs->remote_partition =3D false; + /* disable a partition should only delete exclusive cpus */ + partition_xcpus_del(cs->partition_root_state, + parent, cs->effective_xcpus); + /* effective_xcpus may need to be changed */ + compute_excpus(cs, cs->effective_xcpus); + partition_state_update(cs, new_prs, prs_err); + spin_unlock_irq(&callback_lock); + update_isolation_cpumasks(); + cpuset_force_rebuild(); + /* Clear exclusive flag; no errors are expected */ + update_partition_exclusive_flag(cs, new_prs); + notify_partition_change(cs, old_prs); +} + /* * remote_partition_enable - Enable current cpuset as a remote partition r= oot * @cs: the cpuset to update --=20 2.34.1