[PATCH] sched_ext: create_dsq: Return -EEXIST on duplicate request
From: Jake Hillion
Date: Tue Mar 25 2025 - 18:42:46 EST
create_dsq and therefore the scx_bpf_create_dsq kfunc currently silently
ignore duplicate entries. As a sched_ext scheduler is creating each DSQ
for a different purpose this is surprising behaviour.
Replace rhashtable_insert_fast which ignores duplicates with
rhashtable_lookup_insert_fast that reports duplicates (though doesn't
return their value). The rest of the code is structured correctly and
this now returns -EEXIST.
Tested by adding an extra scx_bpf_create_dsq to scx_simple. Previously
this was ignored, now init fails with a -17 code. Also ran scx_lavd
which continued to work well.
Signed-off-by: Jake Hillion <jake@xxxxxxxxxxxxx>
---
kernel/sched/ext.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 21575d39c376..b47be2729ece 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -4171,8 +4171,8 @@ static struct scx_dispatch_q *create_dsq(u64 dsq_id, int node)
init_dsq(dsq, dsq_id);
- ret = rhashtable_insert_fast(&dsq_hash, &dsq->hash_node,
- dsq_hash_params);
+ ret = rhashtable_lookup_insert_fast(&dsq_hash, &dsq->hash_node,
+ dsq_hash_params);
if (ret) {
kfree(dsq);
return ERR_PTR(ret);
--
2.47.2