kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/include/linux/sched/wake_q.h
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@@ -24,9 +24,13 @@
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  * called near the end of a function. Otherwise, the list can be
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  * re-initialized for later re-use by wake_q_init().
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  *
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- * Note that this can cause spurious wakeups. schedule() callers
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+ * NOTE that this can cause spurious wakeups. schedule() callers
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  * must ensure the call is done inside a loop, confirming that the
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  * wakeup condition has in fact occurred.
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+ *
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+ * NOTE that there is no guarantee the wakeup will happen any later than the
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+ * wake_q_add() location. Therefore task must be ready to be woken at the
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+ * location of the wake_q_add().
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  */
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 #include <linux/sched.h>
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@@ -49,29 +53,13 @@
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 	head->count = 0;
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 }
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-extern void __wake_q_add(struct wake_q_head *head,
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-			 struct task_struct *task, bool sleeper);
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-static inline void wake_q_add(struct wake_q_head *head,
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-			      struct task_struct *task)
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+static inline bool wake_q_empty(struct wake_q_head *head)
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 {
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-	__wake_q_add(head, task, false);
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+	return head->first == WAKE_Q_TAIL;
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 }
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-static inline void wake_q_add_sleeper(struct wake_q_head *head,
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-				      struct task_struct *task)
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-{
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-	__wake_q_add(head, task, true);
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-}
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-
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-extern void __wake_up_q(struct wake_q_head *head, bool sleeper);
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-static inline void wake_up_q(struct wake_q_head *head)
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-{
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-	__wake_up_q(head, false);
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-}
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-
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-static inline void wake_up_q_sleeper(struct wake_q_head *head)
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-{
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-	__wake_up_q(head, true);
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-}
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+extern void wake_q_add(struct wake_q_head *head, struct task_struct *task);
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+extern void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task);
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+extern void wake_up_q(struct wake_q_head *head);
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 #endif /* _LINUX_SCHED_WAKE_Q_H */