futex: Allow for compiling out PI support

This makes it possible to preserve basic futex support and compile out the PI support when RT mutexes are not available.

Nicolas Pitre committed 9 years ago

Commit bc2eecd1 parent f06e8c54 files · +63 −2Browse files

Showing the changes to kernel/locking (1 of 4 files). Show all

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@@ -40,6 +40,9 @@ struct rt_mutex_waiter { · 39 unmodified lines
40	40	/*
41	41	* Various helpers to access the waiters-tree:
42	42	*/
	43	+
	44	+#ifdef CONFIG_RT_MUTEXES
	45	+
43	46	static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
44	47	{
45	48	return !RB_EMPTY_ROOT(&lock->waiters);
@@ -69,6 +72,32 @@ task_top_pi_waiter(struct task_struct *p) · 23 unmodified lines
69	72	pi_tree_entry);
70	73	}
71	74
	75	+#else
	76	+
	77	+static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
	78	+{
	79	+ return false;
	80	+}
	81	+
	82	+static inline struct rt_mutex_waiter *
	83	+rt_mutex_top_waiter(struct rt_mutex *lock)
	84	+{
	85	+ return NULL;
	86	+}
	87	+
	88	+static inline int task_has_pi_waiters(struct task_struct *p)
	89	+{
	90	+ return false;
	91	+}
	92	+
	93	+static inline struct rt_mutex_waiter *
	94	+task_top_pi_waiter(struct task_struct *p)
	95	+{
	96	+ return NULL;
	97	+}
	98	+
	99	+#endif
	100	+
72	101	/*
73	102	* lock->owner state tracking:
74	103	*/