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	* Various helpers to access the waiters-tree:	41	* Various helpers to access the waiters-tree:
42	*/	42	*/
		43
		44	#ifdef CONFIG_RT_MUTEXES
		45
43	static inline int rt_mutex_has_waiters(struct rt_mutex *lock)	46	static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
44	{	47	{
45	return !RB_EMPTY_ROOT(&lock->waiters);	48	return !RB_EMPTY_ROOT(&lock->waiters);
@@ -69,6 +72,32 @@ task_top_pi_waiter(struct task_struct *p) · 23 unmodified lines
69	pi_tree_entry);	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	* lock->owner state tracking:	102	* lock->owner state tracking:
74	*/	103	*/