[PATCH v4 08/10] sched/topology: Remove SD_SERIALIZE degeneration special case

[Valentin Schneider]

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 <peterz@xxxxxxxxxxxxx>
Signed-off-by: Valentin Schneider <valentin.schneider@xxxxxxx>
---
 kernel/sched/topology.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 93a7ff52335b..c6ecc395c76c 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -204,8 +204,6 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
 			    SD_SHARE_PKG_RESOURCES |
 			    SD_OVERLAP |
 			    SD_PREFER_SIBLING);
-		if (nr_node_ids == 1)
-			pflags &= ~SD_SERIALIZE;
 	}
 	if (~cflags & pflags)
 		return 0;
-- 
2.27.0