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sched: Restructure sched_class order sanity checks in sched_init()

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Currently, sched_init() checks that the sched_class'es are in the expected
order by testing each adjacency which is a bit brittle and makes it
cumbersome to add optional sched_class'es. Instead, let's verify whether
they're in the expected order using sched_class_above() which is what
matters.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: David Vernet <dvernet@meta.com>
This commit is contained in:
Tejun Heo
2024-06-18 10:09:16 -10:00
parent 8cce475922
commit df268382ad
1 changed files with 4 additions and 4 deletions
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kernel/sched/core.c
+4 -4
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@@ -8164,12 +8164,12 @@ void __init sched_init(void)
int i;
/* Make sure the linker didn't screw up */
BUG_ON(&idle_sched_class != &fair_sched_class + 1 ||
&fair_sched_class != &rt_sched_class + 1 ||
&rt_sched_class != &dl_sched_class + 1);
#ifdef CONFIG_SMP
BUG_ON(&dl_sched_class != &stop_sched_class + 1);
BUG_ON(!sched_class_above(&stop_sched_class, &dl_sched_class));
#endif
BUG_ON(!sched_class_above(&dl_sched_class, &rt_sched_class));
BUG_ON(!sched_class_above(&rt_sched_class, &fair_sched_class));
BUG_ON(!sched_class_above(&fair_sched_class, &idle_sched_class));
wait_bit_init();