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sched: Convert pi_lock to raw_spinlock

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Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2009-11-17 14:54:03 +01:00
parent fe841226bd
commit 1d61548254
8 changed files with 61 additions and 61 deletions
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58
kernel/rtmutex.c
View file

@ -138,9 +138,9 @@ static void rt_mutex_adjust_prio(struct task_struct *task)
{
unsigned long flags;
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
__rt_mutex_adjust_prio(task);
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
}
/*
@ -195,7 +195,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
/*
* Task can not go away as we did a get_task() before !
*/
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
waiter = task->pi_blocked_on;
/*
@ -232,7 +232,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
lock = waiter->lock;
if (!spin_trylock(&lock->wait_lock)) {
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
cpu_relax();
goto retry;
}
@ -253,13 +253,13 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
plist_add(&waiter->list_entry, &lock->wait_list);
/* Release the task */
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
put_task_struct(task);
/* Grab the next task */
task = rt_mutex_owner(lock);
get_task_struct(task);
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
if (waiter == rt_mutex_top_waiter(lock)) {
/* Boost the owner */
@ -277,7 +277,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
__rt_mutex_adjust_prio(task);
}
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
top_waiter = rt_mutex_top_waiter(lock);
spin_unlock(&lock->wait_lock);
@ -288,7 +288,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
goto again;
out_unlock_pi:
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
out_put_task:
put_task_struct(task);
@ -313,9 +313,9 @@ static inline int try_to_steal_lock(struct rt_mutex *lock,
if (pendowner == task)
return 1;
spin_lock_irqsave(&pendowner->pi_lock, flags);
raw_spin_lock_irqsave(&pendowner->pi_lock, flags);
if (task->prio >= pendowner->prio) {
spin_unlock_irqrestore(&pendowner->pi_lock, flags);
raw_spin_unlock_irqrestore(&pendowner->pi_lock, flags);
return 0;
}
@ -325,7 +325,7 @@ static inline int try_to_steal_lock(struct rt_mutex *lock,
* priority.
*/
if (likely(!rt_mutex_has_waiters(lock))) {
spin_unlock_irqrestore(&pendowner->pi_lock, flags);
raw_spin_unlock_irqrestore(&pendowner->pi_lock, flags);
return 1;
}
@ -333,7 +333,7 @@ static inline int try_to_steal_lock(struct rt_mutex *lock,
next = rt_mutex_top_waiter(lock);
plist_del(&next->pi_list_entry, &pendowner->pi_waiters);
__rt_mutex_adjust_prio(pendowner);
spin_unlock_irqrestore(&pendowner->pi_lock, flags);
raw_spin_unlock_irqrestore(&pendowner->pi_lock, flags);
/*
* We are going to steal the lock and a waiter was
@ -350,10 +350,10 @@ static inline int try_to_steal_lock(struct rt_mutex *lock,
* might be task:
*/
if (likely(next->task != task)) {
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
plist_add(&next->pi_list_entry, &task->pi_waiters);
__rt_mutex_adjust_prio(task);
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
}
return 1;
}
@ -420,7 +420,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
unsigned long flags;
int chain_walk = 0, res;
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
__rt_mutex_adjust_prio(task);
waiter->task = task;
waiter->lock = lock;
@ -434,17 +434,17 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
task->pi_blocked_on = waiter;
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
if (waiter == rt_mutex_top_waiter(lock)) {
spin_lock_irqsave(&owner->pi_lock, flags);
raw_spin_lock_irqsave(&owner->pi_lock, flags);
plist_del(&top_waiter->pi_list_entry, &owner->pi_waiters);
plist_add(&waiter->pi_list_entry, &owner->pi_waiters);
__rt_mutex_adjust_prio(owner);
if (owner->pi_blocked_on)
chain_walk = 1;
spin_unlock_irqrestore(&owner->pi_lock, flags);
raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
}
else if (debug_rt_mutex_detect_deadlock(waiter, detect_deadlock))
chain_walk = 1;
@ -483,7 +483,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
struct task_struct *pendowner;
unsigned long flags;
spin_lock_irqsave(&current->pi_lock, flags);
raw_spin_lock_irqsave(&current->pi_lock, flags);
waiter = rt_mutex_top_waiter(lock);
plist_del(&waiter->list_entry, &lock->wait_list);
@ -500,7 +500,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
rt_mutex_set_owner(lock, pendowner, RT_MUTEX_OWNER_PENDING);
spin_unlock_irqrestore(&current->pi_lock, flags);
raw_spin_unlock_irqrestore(&current->pi_lock, flags);
/*
* Clear the pi_blocked_on variable and enqueue a possible
@ -509,7 +509,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
* waiter with higher priority than pending-owner->normal_prio
* is blocked on the unboosted (pending) owner.
*/
spin_lock_irqsave(&pendowner->pi_lock, flags);
raw_spin_lock_irqsave(&pendowner->pi_lock, flags);
WARN_ON(!pendowner->pi_blocked_on);
WARN_ON(pendowner->pi_blocked_on != waiter);
@ -523,7 +523,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
next = rt_mutex_top_waiter(lock);
plist_add(&next->pi_list_entry, &pendowner->pi_waiters);
}
spin_unlock_irqrestore(&pendowner->pi_lock, flags);
raw_spin_unlock_irqrestore(&pendowner->pi_lock, flags);
wake_up_process(pendowner);
}
@ -541,15 +541,15 @@ static void remove_waiter(struct rt_mutex *lock,
unsigned long flags;
int chain_walk = 0;
spin_lock_irqsave(&current->pi_lock, flags);
raw_spin_lock_irqsave(&current->pi_lock, flags);
plist_del(&waiter->list_entry, &lock->wait_list);
waiter->task = NULL;
current->pi_blocked_on = NULL;
spin_unlock_irqrestore(&current->pi_lock, flags);
raw_spin_unlock_irqrestore(&current->pi_lock, flags);
if (first && owner != current) {
spin_lock_irqsave(&owner->pi_lock, flags);
raw_spin_lock_irqsave(&owner->pi_lock, flags);
plist_del(&waiter->pi_list_entry, &owner->pi_waiters);
@ -564,7 +564,7 @@ static void remove_waiter(struct rt_mutex *lock,
if (owner->pi_blocked_on)
chain_walk = 1;
spin_unlock_irqrestore(&owner->pi_lock, flags);
raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
}
WARN_ON(!plist_node_empty(&waiter->pi_list_entry));
@ -592,15 +592,15 @@ void rt_mutex_adjust_pi(struct task_struct *task)
struct rt_mutex_waiter *waiter;
unsigned long flags;
spin_lock_irqsave(&task->pi_lock, flags);
raw_spin_lock_irqsave(&task->pi_lock, flags);
waiter = task->pi_blocked_on;
if (!waiter || waiter->list_entry.prio == task->prio) {
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
return;
}
spin_unlock_irqrestore(&task->pi_lock, flags);
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
/* gets dropped in rt_mutex_adjust_prio_chain()! */
get_task_struct(task);