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Howlett" To: Andrew Morton Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Liam R. Howlett" , stable@vger.kernel.org, Geert Uytterhoeven , "Paul E. McKenney" , Christophe Leroy , Andreas Schwab , Matthew Wilcox , Peng Zhang , Peter Zijlstra , Ingo Molnar , Juri Lelli , Vincent Guittot , "Mike Rapoport (IBM)" , Vlastimil Babka Subject: [PATCH v2] kernel/sched: Modify initial boot task idle setup Date: Fri, 15 Sep 2023 13:44:44 -0400 Message-Id: <20230915174444.2835306-1-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: YT2PR01CA0026.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:38::31) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|IA1PR10MB6243:EE_ X-MS-Office365-Filtering-Correlation-Id: 0bd6aa0c-66d9-4d0f-f035-08dbb6137a39 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB6243 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-15_14,2023-09-15_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309150159 X-Proofpoint-GUID: TCLnCxuw_HOsrkz8WkNiqECUKa0iEXpy X-Proofpoint-ORIG-GUID: TCLnCxuw_HOsrkz8WkNiqECUKa0iEXpy Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Initial booting is setting the task flag to idle (PF_IDLE) by the call path sched_init() -> init_idle(). Having the task idle and calling call_rcu() in kernel/rcu/tiny.c means that TIF_NEED_RESCHED will be set. Subsequent calls to any cond_resched() will enable IRQs, potentially earlier than the IRQ setup has completed. Recent changes have caused just this scenario and IRQs have been enabled early. This causes a warning later in start_kernel() as interrupts are enabled before they are fully set up. Fix this issue by setting the PF_IDLE flag later in the boot sequence. Although the boot task was marked as idle since (at least) d80e4fda576d, I am not sure that it is wrong to do so. The forced context-switch on idle task was introduced in the tiny_rcu update, so I'm going to claim this fixes 5f6130fa52ee. Link: https://lore.kernel.org/linux-mm/87v8cv22jh.fsf@mail.lhotse/ Link: https://lore.kernel.org/linux-mm/CAMuHMdWpvpWoDa=3DOx-do92czYRvkok6_x= 6pYUH+ZouMcJbXy+Q@mail.gmail.com/ Fixes: 5f6130fa52ee ("tiny_rcu: Directly force QS when call_rcu_[bh|sched](= ) on idle_task") Cc: stable@vger.kernel.org Cc: Geert Uytterhoeven Cc: "Paul E. McKenney" Cc: Christophe Leroy Cc: Andreas Schwab Cc: Matthew Wilcox Cc: Peng Zhang Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Juri Lelli Cc: Vincent Guittot Cc: Andrew Morton Cc: "Mike Rapoport (IBM)" Cc: Vlastimil Babka Signed-off-by: Liam R. Howlett Tested-by: Geert Uytterhoeven --- v1: https://lore.kernel.org/linux-mm/20230913005647.1534747-1-Liam.Howlett@= oracle.com/ kernel/sched/core.c | 2 +- kernel/sched/idle.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c52c2eba7c73..e8f73ff12126 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -9271,7 +9271,7 @@ void __init init_idle(struct task_struct *idle, int c= pu) * PF_KTHREAD should already be set at this point; regardless, make it * look like a proper per-CPU kthread. */ - idle->flags |=3D PF_IDLE | PF_KTHREAD | PF_NO_SETAFFINITY; + idle->flags |=3D PF_KTHREAD | PF_NO_SETAFFINITY; kthread_set_per_cpu(idle, cpu); =20 #ifdef CONFIG_SMP diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index 342f58a329f5..5007b25c5bc6 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -373,6 +373,7 @@ EXPORT_SYMBOL_GPL(play_idle_precise); =20 void cpu_startup_entry(enum cpuhp_state state) { + current->flags |=3D PF_IDLE; arch_cpu_idle_prepare(); cpuhp_online_idle(state); while (1) --=20 2.39.2