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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jan 2026 13:09:03.6361 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e93edb2b-d847-40d2-2ed2-08de52a4ecfe X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF0000B620.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8567 On 1/13/26 12:56, Peter Zijlstra wrote: > On Tue, Jan 13, 2026 at 12:53:09PM +0100, Peter Zijlstra wrote: >> On Tue, Jan 13, 2026 at 04:35:02PM +0530, K Prateek Nayak wrote: >> >>> Does enabling WARN_DOUBLE_CLOCK warn of a double clock update before >>> hitting this warning? >> setup_new_dl_entity() -> update_rq_clock() seems like it will trip that >> in this case. > Something like so to fix: 9f239df55546 ("sched/deadline: Initialize dl_servers after SMP") > > > --- a/kernel/sched/deadline.c > +++ b/kernel/sched/deadline.c > @@ -752,8 +752,6 @@ static inline void setup_new_dl_entity(s > struct dl_rq *dl_rq = dl_rq_of_se(dl_se); > struct rq *rq = rq_of_dl_rq(dl_rq); > > - update_rq_clock(rq); > - > WARN_ON(is_dl_boosted(dl_se)); > WARN_ON(dl_time_before(rq_clock(rq), dl_se->deadline)); > > @@ -1834,6 +1832,7 @@ void sched_init_dl_servers(void) > rq = cpu_rq(cpu); > > guard(rq_lock_irq)(rq); > + update_rq_clock(rq); > > dl_se = &rq->fair_server; > Yes right, enabling WARN_DOUBLE_CLOCK detects the double clock update and this fixes it.