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) <pet...@infradead.org>
---
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;
