If there is only a single NUMA node in the system, the only NUMA topology level that will be generated will be NODE (identity distance), which doesn't have SD_SERIALIZE.
This means we don't need this special case in sd_parent_degenerate(), as having the NODE level "naturally" covers it. Thus, remove it. Suggested-by: Peter Zijlstra <[email protected]> Reviewed-by: Dietmar Eggemann <[email protected]> Signed-off-by: Valentin Schneider <[email protected]> --- kernel/sched/topology.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 5f2bc99ff659..00ad7cef2ec1 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -183,11 +183,9 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) return 0; /* Flags needing groups don't count if only 1 group in parent */ - if (parent->groups == parent->groups->next) { + if (parent->groups == parent->groups->next) pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING); - if (nr_node_ids == 1) - pflags &= ~SD_SERIALIZE; - } + if (~cflags & pflags) return 0; -- 2.27.0
