Its an obsolete debug mechanism and future code wants to rely on properties this undermines. Namely, it would be good to assume that SD_OVERLAP domains have children, but if we build the entire hierarchy with SD_OVERLAP this is obviously false. Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/features.h | 1 - kernel/sched/topology.c | 2 +- 2 files changed, 1 insertion(+), 2 deletions(-) --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -76,7 +76,6 @@ SCHED_FEAT(WARN_DOUBLE_CLOCK, false) SCHED_FEAT(RT_PUSH_IPI, true) #endif -SCHED_FEAT(FORCE_SD_OVERLAP, false) SCHED_FEAT(RT_RUNTIME_SHARE, true) SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1439,7 +1439,7 @@ build_sched_domains(const struct cpumask sd = build_sched_domain(tl, cpu_map, attr, sd, i); if (tl == sched_domain_topology) *per_cpu_ptr(d.sd, i) = sd; - if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP)) + if (tl->flags & SDTL_OVERLAP) sd->flags |= SD_OVERLAP; if (cpumask_equal(cpu_map, sched_domain_span(sd))) break;