From: Tejun Heo <tj@kernel.org> mainline inclusion from mainline-v6.12-rc1 commit df268382adc1f7aa3ad92f7de71b70395f24e4e7 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8335IDC9YK Reference: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commi... -------------------------------- 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> Signed-off-by: Zicheng Qu <quzicheng@huawei.com> Signed-off-by: cheliequan <cheliequan@inspur.com> Signed-off-by: Luo Gengkun <luogengkun2@huawei.com> --- kernel/sched/core.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d9afdd7e588e..c4f4131389ec 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -10048,12 +10048,12 @@ 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(); -- 2.34.1