DL-Mirrors/kernel-tenderloin-3.0
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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
Download Patch File Download Diff File Expand all files Collapse all files

38
kernel/futex.c
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@@ -403,9 +403,9 @@ static void free_pi_state(struct futex_pi_state *pi_state)
* and has cleaned up the pi_state already
*/
if (pi_state->owner) {
spin_lock_irq(&pi_state->owner->pi_lock);
raw_spin_lock_irq(&pi_state->owner->pi_lock);
list_del_init(&pi_state->list);
spin_unlock_irq(&pi_state->owner->pi_lock);
raw_spin_unlock_irq(&pi_state->owner->pi_lock);
rt_mutex_proxy_unlock(&pi_state->pi_mutex, pi_state->owner);
}
@@ -470,18 +470,18 @@ void exit_pi_state_list(struct task_struct *curr)
* pi_state_list anymore, but we have to be careful
* versus waiters unqueueing themselves:
*/
spin_lock_irq(&curr->pi_lock);
raw_spin_lock_irq(&curr->pi_lock);
while (!list_empty(head)) {
next = head->next;
pi_state = list_entry(next, struct futex_pi_state, list);
key = pi_state->key;
hb = hash_futex(&key);
spin_unlock_irq(&curr->pi_lock);
raw_spin_unlock_irq(&curr->pi_lock);
spin_lock(&hb->lock);
spin_lock_irq(&curr->pi_lock);
raw_spin_lock_irq(&curr->pi_lock);
/*
* We dropped the pi-lock, so re-check whether this
* task still owns the PI-state:
@@ -495,15 +495,15 @@ void exit_pi_state_list(struct task_struct *curr)
WARN_ON(list_empty(&pi_state->list));
list_del_init(&pi_state->list);
pi_state->owner = NULL;
spin_unlock_irq(&curr->pi_lock);
raw_spin_unlock_irq(&curr->pi_lock);
rt_mutex_unlock(&pi_state->pi_mutex);
spin_unlock(&hb->lock);
spin_lock_irq(&curr->pi_lock);
raw_spin_lock_irq(&curr->pi_lock);
}
spin_unlock_irq(&curr->pi_lock);
raw_spin_unlock_irq(&curr->pi_lock);
}
static int
@@ -558,7 +558,7 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
* change of the task flags, we do this protected by
* p->pi_lock:
*/
spin_lock_irq(&p->pi_lock);
raw_spin_lock_irq(&p->pi_lock);
if (unlikely(p->flags & PF_EXITING)) {
/*
* The task is on the way out. When PF_EXITPIDONE is
@@ -567,7 +567,7 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
*/
int ret = (p->flags & PF_EXITPIDONE) ? -ESRCH : -EAGAIN;
spin_unlock_irq(&p->pi_lock);
raw_spin_unlock_irq(&p->pi_lock);
put_task_struct(p);
return ret;
}
@@ -586,7 +586,7 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
WARN_ON(!list_empty(&pi_state->list));
list_add(&pi_state->list, &p->pi_state_list);
pi_state->owner = p;
spin_unlock_irq(&p->pi_lock);
raw_spin_unlock_irq(&p->pi_lock);
put_task_struct(p);
@@ -794,16 +794,16 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
}
}
spin_lock_irq(&pi_state->owner->pi_lock);
raw_spin_lock_irq(&pi_state->owner->pi_lock);
WARN_ON(list_empty(&pi_state->list));
list_del_init(&pi_state->list);
spin_unlock_irq(&pi_state->owner->pi_lock);
raw_spin_unlock_irq(&pi_state->owner->pi_lock);
spin_lock_irq(&new_owner->pi_lock);
raw_spin_lock_irq(&new_owner->pi_lock);
WARN_ON(!list_empty(&pi_state->list));
list_add(&pi_state->list, &new_owner->pi_state_list);
pi_state->owner = new_owner;
spin_unlock_irq(&new_owner->pi_lock);
raw_spin_unlock_irq(&new_owner->pi_lock);
spin_unlock(&pi_state->pi_mutex.wait_lock);
rt_mutex_unlock(&pi_state->pi_mutex);
@@ -1529,18 +1529,18 @@ retry:
* itself.
*/
if (pi_state->owner != NULL) {
spin_lock_irq(&pi_state->owner->pi_lock);
raw_spin_lock_irq(&pi_state->owner->pi_lock);
WARN_ON(list_empty(&pi_state->list));
list_del_init(&pi_state->list);
spin_unlock_irq(&pi_state->owner->pi_lock);
raw_spin_unlock_irq(&pi_state->owner->pi_lock);
}
pi_state->owner = newowner;
spin_lock_irq(&newowner->pi_lock);
raw_spin_lock_irq(&newowner->pi_lock);
WARN_ON(!list_empty(&pi_state->list));
list_add(&pi_state->list, &newowner->pi_state_list);
spin_unlock_irq(&newowner->pi_lock);
raw_spin_unlock_irq(&newowner->pi_lock);
return 0;
/*