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sched_ext: Make scx_group_set_weight() always update tg->scx.weight

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Otherwise, tg->scx.weight can go out of sync while scx_cgroup is not enabled
and ops.cgroup_init() may be called with a stale weight value.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 8195136669 ("sched_ext: Add cgroup support")
Cc: stable@vger.kernel.org # v6.12+
This commit is contained in:
Tejun Heo 2025-06-13 13:23:07 -10:00
parent 47096d301e
commit c50784e99f
1 changed files with 6 additions and 6 deletions
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6
kernel/sched/ext.c
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@ -4241,12 +4241,12 @@ void scx_group_set_weight(struct task_group *tg, unsigned long weight)
percpu_down_read(&scx_cgroup_rwsem);
if (scx_cgroup_enabled && tg->scx_weight != weight) {
if (SCX_HAS_OP(sch, cgroup_set_weight))
if (scx_cgroup_enabled && SCX_HAS_OP(sch, cgroup_set_weight) &&
tg->scx_weight != weight)
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_set_weight, NULL,
tg_cgrp(tg), weight);
tg->scx_weight = weight;
}
percpu_up_read(&scx_cgroup_rwsem);
}