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sched: add READ_ONCE to task_on_rq_queued

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task_on_rq_queued read p->on_rq without READ_ONCE, though p->on_rq is
set with WRITE_ONCE in {activate|deactivate}_task and smp_store_release
in __block_task, and also read with READ_ONCE in task_on_rq_migrating.

Make all of these accesses pair together by adding READ_ONCE in the
task_on_rq_queued.

Signed-off-by: Harshit Agarwal <harshit@nutanix.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Link: https://lkml.kernel.org/r/20241114210812.1836587-1-jon@nutanix.com
This commit is contained in:
Harshit Agarwal 2024-11-14 14:08:11 -07:00 committed by Peter Zijlstra
parent 108ad09990
commit 59297e2093
1 changed files with 1 additions and 1 deletions
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kernel/sched/sched.h
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@ -2271,7 +2271,7 @@ static inline int task_on_cpu(struct rq *rq, struct task_struct *p)
static inline int task_on_rq_queued(struct task_struct *p)
{
return p->on_rq == TASK_ON_RQ_QUEUED;
return READ_ONCE(p->on_rq) == TASK_ON_RQ_QUEUED;
}
static inline int task_on_rq_migrating(struct task_struct *p)