sched_ext: Drop unused scx_find_sub_sched() stub

scx_find_sub_sched()'s only caller, scx_bpf_sub_dispatch(), is gated on
CONFIG_EXT_SUB_SCHED. When CONFIG_EXT_SUB_SCHED=n the caller compiles out
and the stub becomes dead code, tripping -Wunused-function on randconfigs.
Drop the stub.

Fixes: 25037af712eb ("sched_ext: Add rhashtable lookup for sub-schedulers")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/all/202605080556.42PXw8U9-lkp@intel.com/
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 7d367c140a36be6923c899c7bff346e130c1ba0e..48b4834c7027025b8471d7e3df9ca2cc684f0c6e 100644 (file)
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -297,7 +297,6 @@ static void scx_set_task_sched(struct task_struct *p, struct scx_sched *sch)
 #else  /* CONFIG_EXT_SUB_SCHED */
 static struct scx_sched *scx_parent(struct scx_sched *sch) { return NULL; }
 static struct scx_sched *scx_next_descendant_pre(struct scx_sched *pos, struct scx_sched *root) { return pos ? NULL : root; }
-static struct scx_sched *scx_find_sub_sched(u64 cgroup_id) { return NULL; }
 static void scx_set_task_sched(struct task_struct *p, struct scx_sched *sch) {}
 #endif /* CONFIG_EXT_SUB_SCHED */