Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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Merge tag 'sched_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fix from Borislav Petkov:
- Clarify what happens when a task is woken up from the wake queue and
make clear its removal from that queue is atomic
* tag 'sched_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched: Clarify wake_up_q()'s write to task->wake_q.next
+3
-2
kernel/sched/core.c
+3
-2
kernel/sched/core.c
···
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struct task_struct *task;
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task = container_of(node, struct task_struct, wake_q);
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-
/* Task can safely be re-inserted now: */
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node = node->next;
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-
task->wake_q.next = NULL;
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+
/* pairs with cmpxchg_relaxed() in __wake_q_add() */
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+
WRITE_ONCE(task->wake_q.next, NULL);
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+
/* Task can safely be re-inserted now. */
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/*
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* wake_up_process() executes a full barrier, which pairs with