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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Umwmid6fwbFRdb77XqdpfvoLa6O5VJqHvy1qrDbaz9xPeu7fDeR+1aw+R8LY?= =?us-ascii?Q?V2yQPC2jqBeRfwUXtz/vpIHfZvPQzY2UA9fWXoupRHuHFd39dbPmfiCGZsJR?= =?us-ascii?Q?sb6iNxyzrL6rrz74EKt6jiuuHuEYjaCTFQVNZmGzr9PoQE5NiTkRevf7+PCo?= =?us-ascii?Q?iFZB3e0RUU48FZtQp6n5WTNpUmrmYafMpZJhqhKkF1+SNdqLM5JJCsYpzaZx?= =?us-ascii?Q?I7ydy/TnIatZbROVUj86AMFAc+JXcxBz3TYmQOCo/kzrFTh6NOQrwyMmxGc4?= =?us-ascii?Q?82pv2jyhoRt+VVy6WQocFgGUCZmQe2PIm+NdLBQTIa8jeDrLdCZKJYLa7U4J?= =?us-ascii?Q?orwfRRZ2vKCB1h+4DFDUf0x5f2JKG3d/gthywL51/tRRybILjjzAC2R/qLVW?= =?us-ascii?Q?t0k2y6BSaL8yqN4YL9l+9RXn86Rmn5yvPbzJplUCwYc7mZRxAxQ0sQWcI/xo?= =?us-ascii?Q?HJGIFh+uwAlFVxTwYfG/P4FKj8owWJ7q/BCmy7QfV+LWDa7QSi2K79XqQ9E1?= =?us-ascii?Q?+ld5uYxsQ16IIvIQmjJfumQVJ8gaAgn8WyzxbnijEWEIkN50bQYnf4FoVU6c?= =?us-ascii?Q?x20xu9XgBIYfUde4TLuKFvIbNA/EDMn8bu4lJXs3rxbFPjCUuFkm29uKSED1?= =?us-ascii?Q?yzdwlKImSYO0oktddjYHcaZJ3K8PbPgEqf0Ghs6IXktXP7wuiZEG5fUGBwUj?= =?us-ascii?Q?vOA5SEu5r3Oym7QmallRaTTY/uhz8FeZojbqXzDZg8zFD88ZhOnggTeXw1rI?= =?us-ascii?Q?guPrL2WMqO0KssrYI78E5kvATYMTMmiqnRdhtjaqUG8+jEF1c6o6YWRv5V2W?= =?us-ascii?Q?NOBBuGe7/o0MP50S2vz+J7sin75aty6cLoIvwJHibpv65abuMOChjhhzEO0a?= =?us-ascii?Q?+OWIEyfc2FZNX+H2HdWh6cYi1RIEQ+SrjuH+GajTvs+THR2V5vHMzKflYUf8?= =?us-ascii?Q?79irDRh0lDKySOyyKK/LoOkhtveyx1PFDmrblVB7JkQ6wVsu01f8IviqBDKG?= =?us-ascii?Q?6pp5q2cj8l7PePBvOIG+3s8y4YaQ5bDSACs+eZ6cy0rlFWfI2nKeEUpL8sjb?= =?us-ascii?Q?ihZXQD5bRCVFjBXAYssKw/zlAyMMgFZUAksAbbrtKj5gCS7FXWkkcqVgxSgK?= =?us-ascii?Q?502SlO2PTN7oRFzAIgXjpddvgZDq46Kvlnk0LcyFVuNKDptnpOhyzmrnKfTy?= =?us-ascii?Q?ZrZwZlik7pj9F8PqrqcZrL9up9aUqJ6DJSCehpjnX5KRpOytInuYIi7kqnQt?= =?us-ascii?Q?b7POqTuItxHaQ4yYIhZxecSSotphxSStflFDJ2V+pGcG0hF0jFZ9SkjSuzQH?= =?us-ascii?Q?au2mNBoph3Svn8GNm349w9H3mCeyZCRhBEohj7VSIuDa0fF0S2csdAWuFbaf?= =?us-ascii?Q?Q0BGo78UkmYlQKgh788utTJxc6sFik/OCKfhlS0uA+13RlZai4fDVf3RBiCE?= =?us-ascii?Q?TgBbP4tbGRFa3qBT8FPGf0iin/A+GbcogE2Cvgm6V2j6MnxQJzTCgLPkP1wu?= =?us-ascii?Q?i3loeS5oouh12ZIeJ4Sq/syU/26LiMyFVI70RQCMuxZ9L75BX6db73zs8rog?= =?us-ascii?Q?cz4SN2EqaPU5wPe/sJAy740GWvjd68HXF6oTbzR/z1h/GyLHZ5u61sPvCiGl?= =?us-ascii?Q?RR0rm2jZ+sYZFtrkdVc3XOJ9jJFevVWxhtzm/20UqF/I/puhCYrBmXCdSCAs?= =?us-ascii?Q?4hqWKLSXOefLkTaSO0RDNKPokNBS6cfiHvg8K4XnSs2ZC7GLSBqTlQxhspCi?= =?us-ascii?Q?Oo1M9KaOKg=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9429e8b4-dc1c-4a0e-5adf-08dece3423ea X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB4827.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jun 2026 18:54:07.1664 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ASQeEkGxOQ0Tpb1XNKwqzw5uaDKvioxpVwSJQ/w+P1a7ey5zIP5KxX8K9b6QmZiMnIaaO6JBGuo//fNiBhTsGg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4190 Hi Christian, On Fri, Jun 19, 2026 at 04:59:20PM +0100, Christian Loehle wrote: > scx_bpf_cpu_rq() exposes rq pointers without requiring the rq lock and > has emitted a deprecation warning since commit > 5c48d88fe004 ("sched_ext: deprecation warn for scx_bpf_cpu_rq()"). > The supported replacements cover the intended uses: > scx_bpf_locked_rq() for locked rq access and > scx_bpf_cpu_curr() for remote curr lookup. > > Remove the kfunc, its BTF registrations, the deprecation warning > state, and the BPF-side prototype and compat fallback. > > Signed-off-by: Christian Loehle It looks like none of the schedulers in the scx repo are using scx_bpf_cpu_rq() anymore, so I think we can safely remove it. Reviewed-by: Andrea Righi Thanks, -Andrea > --- > kernel/sched/ext.c | 30 ------------------------ > kernel/sched/ext_internal.h | 1 - > tools/sched_ext/include/scx/common.bpf.h | 5 ++-- > tools/sched_ext/include/scx/compat.bpf.h | 17 -------------- > 4 files changed, 2 insertions(+), 51 deletions(-) > > diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c > index 0db6fa2daea3..72d99dd3fe89 100644 > --- a/kernel/sched/ext.c > +++ b/kernel/sched/ext.c > @@ -10222,34 +10222,6 @@ __bpf_kfunc s32 scx_bpf_task_cid(const struct task_struct *p) > return tbl[task_cpu(p)]; > } > > -/** > - * scx_bpf_cpu_rq - Fetch the rq of a CPU > - * @cpu: CPU of the rq > - * @aux: implicit BPF argument to access bpf_prog_aux hidden from BPF progs > - */ > -__bpf_kfunc struct rq *scx_bpf_cpu_rq(s32 cpu, const struct bpf_prog_aux *aux) > -{ > - struct scx_sched *sch; > - > - guard(rcu)(); > - > - sch = scx_prog_sched(aux); > - if (unlikely(!sch)) > - return NULL; > - > - if (!scx_cpu_valid(sch, cpu, NULL)) > - return NULL; > - > - if (!sch->warned_deprecated_rq) { > - printk_deferred(KERN_WARNING "sched_ext: %s() is deprecated; " > - "use scx_bpf_locked_rq() when holding rq lock " > - "or scx_bpf_cpu_curr() to read remote curr safely.\n", __func__); > - sch->warned_deprecated_rq = true; > - } > - > - return cpu_rq(cpu); > -} > - > /** > * scx_bpf_locked_rq - Return the rq currently locked by SCX > * @aux: implicit BPF argument to access bpf_prog_aux hidden from BPF progs > @@ -10540,7 +10512,6 @@ BTF_ID_FLAGS(func, scx_bpf_put_cpumask, KF_RELEASE) > BTF_ID_FLAGS(func, scx_bpf_task_running, KF_RCU) > BTF_ID_FLAGS(func, scx_bpf_task_cpu, KF_RCU) > BTF_ID_FLAGS(func, scx_bpf_task_cid, KF_RCU) > -BTF_ID_FLAGS(func, scx_bpf_cpu_rq, KF_IMPLICIT_ARGS) > BTF_ID_FLAGS(func, scx_bpf_locked_rq, KF_IMPLICIT_ARGS | KF_RET_NULL) > BTF_ID_FLAGS(func, scx_bpf_cpu_curr, KF_IMPLICIT_ARGS | KF_RET_NULL | KF_RCU_PROTECTED) > BTF_ID_FLAGS(func, scx_bpf_cid_curr, KF_IMPLICIT_ARGS | KF_RET_NULL | KF_RCU_PROTECTED) > @@ -10575,7 +10546,6 @@ static const struct btf_kfunc_id_set scx_kfunc_set_any = { > BTF_KFUNCS_START(scx_kfunc_ids_cpu_only) > BTF_ID_FLAGS(func, scx_bpf_kick_cpu, KF_IMPLICIT_ARGS) > BTF_ID_FLAGS(func, scx_bpf_task_cpu, KF_RCU) > -BTF_ID_FLAGS(func, scx_bpf_cpu_rq, KF_IMPLICIT_ARGS) > BTF_ID_FLAGS(func, scx_bpf_cpu_curr, KF_IMPLICIT_ARGS | KF_RET_NULL | KF_RCU_PROTECTED) > BTF_ID_FLAGS(func, scx_bpf_cpu_node, KF_IMPLICIT_ARGS) > BTF_ID_FLAGS(func, scx_bpf_cpuperf_cap, KF_IMPLICIT_ARGS) > diff --git a/kernel/sched/ext_internal.h b/kernel/sched/ext_internal.h > index b04701190b23..38f099ccd24f 100644 > --- a/kernel/sched/ext_internal.h > +++ b/kernel/sched/ext_internal.h > @@ -1165,7 +1165,6 @@ struct scx_sched { > * but it doesn't really matter. > */ > bool warned_zero_slice:1; > - bool warned_deprecated_rq:1; > bool warned_unassoc_progs:1; > > struct list_head all; > diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h > index 9591a6e778ce..bd51986c4c42 100644 > --- a/tools/sched_ext/include/scx/common.bpf.h > +++ b/tools/sched_ext/include/scx/common.bpf.h > @@ -96,7 +96,6 @@ s32 scx_bpf_pick_any_cpu_node(const cpumask_t *cpus_allowed, int node, u64 flags > s32 scx_bpf_pick_any_cpu(const cpumask_t *cpus_allowed, u64 flags) __ksym; > bool scx_bpf_task_running(const struct task_struct *p) __ksym; > s32 scx_bpf_task_cpu(const struct task_struct *p) __ksym; > -struct rq *scx_bpf_cpu_rq(s32 cpu) __ksym; > struct rq *scx_bpf_locked_rq(void) __ksym; > struct task_struct *scx_bpf_cpu_curr(s32 cpu) __ksym __weak; > struct task_struct *scx_bpf_tid_to_task(u64 tid) __ksym __weak; > @@ -983,8 +982,8 @@ extern struct irqtime___local cpu_irqtime __ksym __weak; > static inline struct rq___local *get_current_rq(u32 cpu) > { > /* > - * This is a workaround to get an rq pointer since we decided to > - * deprecate scx_bpf_cpu_rq(). > + * This is a workaround to get an rq pointer now that > + * scx_bpf_cpu_rq() has been removed. > * > * WARNING: The caller must hold the rq lock for @cpu. This is > * guaranteed when called from scheduling callbacks (ops.running, > diff --git a/tools/sched_ext/include/scx/compat.bpf.h b/tools/sched_ext/include/scx/compat.bpf.h > index 87f15f296234..133058578668 100644 > --- a/tools/sched_ext/include/scx/compat.bpf.h > +++ b/tools/sched_ext/include/scx/compat.bpf.h > @@ -233,23 +233,6 @@ static inline bool __COMPAT_is_enq_cpu_selected(u64 enq_flags) > scx_bpf_pick_any_cpu_node(cpus_allowed, node, flags) : \ > scx_bpf_pick_any_cpu(cpus_allowed, flags)) > > -/* > - * v6.18: Add a helper to retrieve the current task running on a CPU. > - * > - * Keep this helper available until v6.20 for compatibility. > - */ > -static inline struct task_struct *__COMPAT_scx_bpf_cpu_curr(int cpu) > -{ > - struct rq *rq; > - > - if (bpf_ksym_exists(scx_bpf_cpu_curr)) > - return scx_bpf_cpu_curr(cpu); > - > - rq = scx_bpf_cpu_rq(cpu); > - > - return rq ? rq->curr : NULL; > -} > - > /* > * v6.19: To work around BPF maximum parameter limit, the following kfuncs are > * replaced with variants that pack scalar arguments in a struct. Wrappers are > -- > 2.34.1 >