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locking/rtmutex: Remove pointless CONFIG_RT_MUTEXES=n stubs 

None of these functions are used when CONFIG_RT_MUTEXES=n.

Remove the gunk. Remove pointless comments and clean up the coding style
mess while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210326153943.863379182@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-03-26 16:29:37 +01:00 committed by Ingo Molnar
parent f7efc4799f
commit 37350e3b26
1 changed files with 20 additions and 42 deletions
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54
kernel/locking/rtmutex_common.h
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@ -23,6 +23,9 @@
* @tree_entry: pi node to enqueue into the mutex waiters tree
* @pi_tree_entry: pi node to enqueue into the mutex owner waiters tree
* @task: task reference to the blocked task
* @lock: Pointer to the rt_mutex on which the waiter blocks
* @prio: Priority of the waiter
* @deadline: Deadline of the waiter if applicable
*/
struct rt_mutex_waiter {
struct rb_node tree_entry;
@ -34,18 +37,16 @@ struct rt_mutex_waiter {
};
/*
* Various helpers to access the waiters-tree:
* Must be guarded because this header is included from rcu/tree_plugin.h
* unconditionally.
*/
#ifdef CONFIG_RT_MUTEXES
static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
{
return !RB_EMPTY_ROOT(&lock->waiters.rb_root);
}
static inline struct rt_mutex_waiter *
rt_mutex_top_waiter(struct rt_mutex *lock)
static inline struct rt_mutex_waiter *rt_mutex_top_waiter(struct rt_mutex *lock)
{
struct rb_node *leftmost = rb_first_cached(&lock->waiters);
struct rt_mutex_waiter *w = NULL;
@ -62,42 +63,12 @@ static inline int task_has_pi_waiters(struct task_struct *p)
return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root);
}
static inline struct rt_mutex_waiter *
task_top_pi_waiter(struct task_struct *p)
static inline struct rt_mutex_waiter *task_top_pi_waiter(struct task_struct *p)
{
return rb_entry(p->pi_waiters.rb_leftmost,
struct rt_mutex_waiter, pi_tree_entry);
return rb_entry(p->pi_waiters.rb_leftmost, struct rt_mutex_waiter,
pi_tree_entry);
}
#else
static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
{
return false;
}
static inline struct rt_mutex_waiter *
rt_mutex_top_waiter(struct rt_mutex *lock)
{
return NULL;
}
static inline int task_has_pi_waiters(struct task_struct *p)
{
return false;
}
static inline struct rt_mutex_waiter *
task_top_pi_waiter(struct task_struct *p)
{
return NULL;
}
#endif
/*
* lock->owner state tracking:
*/
#define RT_MUTEX_HAS_WAITERS 1UL
static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
@ -106,6 +77,13 @@ static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
return (struct task_struct *) (owner & ~RT_MUTEX_HAS_WAITERS);
}
#else /* CONFIG_RT_MUTEXES */
/* Used in rcu/tree_plugin.h */
static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
{
return NULL;
}
#endif /* !CONFIG_RT_MUTEXES */
/*
* Constants for rt mutex functions which have a selectable deadlock