From patchwork Sun Mar 30 21:52:41 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Waiman Long X-Patchwork-Id: 14033090 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 438E01DEFF5 for ; Sun, 30 Mar 2025 21:53:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743371633; cv=none; b=MHKtdYRDNwJq6o5HKTtAWfSPKKg4qHxUlLVI+Cs3LS3ZX9Ucxc/x1AW12mA9SEsiqz5NdMaPikhRwhxwhzG5+FQnek4bNctFrCOYmcXKmbH9YvJVUOaHJarw4GmP0XtL0sPV2IGawN4to9gmGE3UY38ngB40+b510+ruD1mo2sI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743371633; c=relaxed/simple; bh=wIACSkeO4vRoizm1S/WsoY1k3BJsNOCB6s2ajv4Hje0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WlZTdII/GvywonO7/JSZONhWjVsS4AvmJbXh1lfMzVceFrJxS3VIchvu2KGJndhSM+mp8bSsWJT3VJFaKng8okhrcmWxlBJI7fAJJxcVKlaW5tuZMPVjxMjeTrtWcntMReyh9ORHVTA9MS0THiKXvNevvCTbx7k6p9nKgSxbNB8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Jxg714VM; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Jxg714VM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1743371631; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GRL+fg9mL/3GjOTKTowst4cQ96q8nZqCEULdMdc92O8=; b=Jxg714VMfRNIOnXkznLvVQTuSWAYNFj01EAg9jmpfdG63sltrNprEXtUhtnsjcMdrQ7ha+ 31kGf9lPhb3HYaH8fbyY02Ga0eilSh3WRwMhaeKA9LI1dSHPK3WJeRLlMs/oSOHksAeaKx lobsSTnmE1apWlSh9eY/5KQejwLISJA= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-287-npDiENFfMz6m-5K-1Pun8w-1; Sun, 30 Mar 2025 17:53:47 -0400 X-MC-Unique: npDiENFfMz6m-5K-1Pun8w-1 X-Mimecast-MFC-AGG-ID: npDiENFfMz6m-5K-1Pun8w_1743371626 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 9F8D518007E1; Sun, 30 Mar 2025 21:53:46 +0000 (UTC) Received: from llong-thinkpadp16vgen1.westford.csb (unknown [10.22.64.34]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 22F061801750; Sun, 30 Mar 2025 21:53:44 +0000 (UTC) From: Waiman Long To: Tejun Heo , Johannes Weiner , =?utf-8?q?Michal_Koutn=C3=BD?= , Shuah Khan Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Waiman Long Subject: [PATCH 03/10] cgroup/cpuset: Fix error handling in remote_partition_disable() Date: Sun, 30 Mar 2025 17:52:41 -0400 Message-ID: <20250330215248.3620801-4-longman@redhat.com> In-Reply-To: <20250330215248.3620801-1-longman@redhat.com> References: <20250330215248.3620801-1-longman@redhat.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 When remote_partition_disable() is called to disable a remote partition, it always sets the partition to an invalid partition state. It should only do so if an error code (prs_err) has been set. Correct that and add proper error code in places where remote_partition_disable() is called due to error. Fixes: 181c8e091aae ("cgroup/cpuset: Introduce remote partition") Signed-off-by: Waiman Long --- kernel/cgroup/cpuset.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index a4d7bfef855f..2c5b25609c56 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1406,6 +1406,7 @@ static int remote_partition_enable(struct cpuset *cs, int new_prs, list_add(&cs->remote_sibling, &remote_children); spin_unlock_irq(&callback_lock); update_unbound_workqueue_cpumask(isolcpus_updated); + cs->prs_err = 0; /* * Propagate changes in top_cpuset's effective_cpus down the hierarchy. @@ -1436,9 +1437,11 @@ static void remote_partition_disable(struct cpuset *cs, struct tmpmasks *tmp) list_del_init(&cs->remote_sibling); isolcpus_updated = partition_xcpus_del(cs->partition_root_state, NULL, tmp->new_cpus); - cs->partition_root_state = -cs->partition_root_state; - if (!cs->prs_err) - cs->prs_err = PERR_INVCPUS; + if (cs->prs_err) + cs->partition_root_state = -cs->partition_root_state; + else + cs->partition_root_state = PRS_MEMBER; + reset_partition_data(cs); spin_unlock_irq(&callback_lock); update_unbound_workqueue_cpumask(isolcpus_updated); @@ -1471,8 +1474,10 @@ static void remote_cpus_update(struct cpuset *cs, struct cpumask *newmask, WARN_ON_ONCE(!cpumask_subset(cs->effective_xcpus, subpartitions_cpus)); - if (cpumask_empty(newmask)) + if (cpumask_empty(newmask)) { + cs->prs_err = PERR_CPUSEMPTY; goto invalidate; + } adding = cpumask_andnot(tmp->addmask, newmask, cs->effective_xcpus); deleting = cpumask_andnot(tmp->delmask, cs->effective_xcpus, newmask); @@ -1482,10 +1487,15 @@ static void remote_cpus_update(struct cpuset *cs, struct cpumask *newmask, * not allocated to other partitions and there are effective_cpus * left in the top cpuset. */ - if (adding && (!capable(CAP_SYS_ADMIN) || - cpumask_intersects(tmp->addmask, subpartitions_cpus) || - cpumask_subset(top_cpuset.effective_cpus, tmp->addmask))) - goto invalidate; + if (adding) { + if (!capable(CAP_SYS_ADMIN)) + cs->prs_err = PERR_ACCESS; + else if (cpumask_intersects(tmp->addmask, subpartitions_cpus) || + cpumask_subset(top_cpuset.effective_cpus, tmp->addmask)) + cs->prs_err = PERR_NOCPUS; + if (cs->prs_err) + goto invalidate; + } spin_lock_irq(&callback_lock); if (adding) @@ -1601,7 +1611,7 @@ static bool prstate_housekeeping_conflict(int prstate, struct cpumask *new_cpus) * The partcmd_update command is used by update_cpumasks_hier() with newmask * NULL and update_cpumask() with newmask set. The partcmd_invalidate is used * by update_cpumask() with NULL newmask. In both cases, the callers won't - * check for error and so partition_root_state and prs_error will be updated + * check for error and so partition_root_state and prs_err will be updated * directly. */ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd, @@ -3753,6 +3763,7 @@ static void cpuset_hotplug_update_tasks(struct cpuset *cs, struct tmpmasks *tmp) if (remote && cpumask_empty(&new_cpus) && partition_is_populated(cs, NULL)) { + cs->prs_err = PERR_HOTPLUG; remote_partition_disable(cs, tmp); compute_effective_cpumask(&new_cpus, cs, parent); remote = false;