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sched_ext: Use rcu_access_pointer() for the first_task comparison

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dsq->first_task is __rcu for the lockless scx_bpf_dsq_peek(). The task
removal path compares it against the departing task with a plain load, which
sparse flags. The comparison runs under the dsq lock and only tests
identity, so rcu_access_pointer() is the fit.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2026-07-25 10:33:24 -10:00
parent ce22834301
commit 6ee471b646
1 changed files with 1 additions and 1 deletions
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kernel/sched/ext/ext.c
+1 -1
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@@ -1654,7 +1654,7 @@ static void task_unlink_from_dsq(struct task_struct *p,
list_del_init(&p->scx.dsq_list.node);
dsq_dec_nr(dsq, p);
if (!(dsq->id & SCX_DSQ_FLAG_BUILTIN) && dsq->first_task == p) {
if (!(dsq->id & SCX_DSQ_FLAG_BUILTIN) && rcu_access_pointer(dsq->first_task) == p) {
struct task_struct *first_task;
first_task = nldsq_next_task(dsq, NULL, false);