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Thu, 6 Mar 2025 05:30:14 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4D26C20049; Thu, 6 Mar 2025 05:30:14 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0722720040; Thu, 6 Mar 2025 05:30:12 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.in.ibm.com (unknown [9.109.215.252]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 6 Mar 2025 05:30:11 +0000 (GMT) From: Shrikanth Hegde To: juri.lelli@redhat.com, linux-kernel@vger.kernel.org Cc: sshegde@linux.ibm.com, mingo@kernel.org, peterz@infradead.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, hbathini@linux.ibm.com, joelagnelf@nvidia.com Subject: [PATCH 1/2] sched/deadline: use online cpus for validating runtime Date: Thu, 6 Mar 2025 10:59:53 +0530 Message-ID: <20250306052954.452005-2-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250306052954.452005-1-sshegde@linux.ibm.com> References: <20250306052954.452005-1-sshegde@linux.ibm.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-TM-AS-GCONF: 00 X-Proofpoint-GUID: QVAUM5Op6aG5qmHiysJsO5E0-zkDT0Nz X-Proofpoint-ORIG-GUID: CiGkXSAqmODroZBFBmVJh_wJKW0iZrdk X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-06_02,2025-03-05_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 bulkscore=0 adultscore=0 spamscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503060034 Content-Type: text/plain; charset="utf-8" ftrace selftest reported failure since writing -1 to sched_rt_runtime_us return -EBUSY. This happens when the possible CPUs is different than the active CPUS. Active CPUs are part of one root domain, while remaining CPUs are part of def_root_domain. Since active cpumask is being used, this results in cpus=3D0 when a non active CPUs is used in the loop. Fix it by looping over the online CPUs instead for validation the bandwidth calculations. Signed-off-by: Shrikanth Hegde Acked-by: Juri Lelli --- kernel/sched/deadline.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 2d0f571f95e9..7ea9c040c72f 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -3187,7 +3187,7 @@ int sched_dl_global_validate(void) * value smaller than the currently allocated bandwidth in * any of the root_domains. */ - for_each_possible_cpu(cpu) { + for_each_online_cpu(cpu) { rcu_read_lock_sched(); =20 if (dl_bw_visited(cpu, gen)) --=20 2.39.3