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-rw-r--r--kernel/rtmutex.c59
1 files changed, 30 insertions, 29 deletions
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 45d6101..3e13a1e 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -7,6 +7,8 @@
* Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
* Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt
* Copyright (C) 2006 Esben Nielsen
+ *
+ * See Documentation/rt-mutex-design.txt for details.
*/
#include <linux/spinlock.h>
#include <linux/module.h>
@@ -157,12 +159,11 @@ int max_lock_depth = 1024;
* Decreases task's usage by one - may thus free the task.
* Returns 0 or -EDEADLK.
*/
-static int rt_mutex_adjust_prio_chain(task_t *task,
+static int rt_mutex_adjust_prio_chain(struct task_struct *task,
int deadlock_detect,
struct rt_mutex *orig_lock,
struct rt_mutex_waiter *orig_waiter,
- struct task_struct *top_task
- __IP_DECL__)
+ struct task_struct *top_task)
{
struct rt_mutex *lock;
struct rt_mutex_waiter *waiter, *top_waiter = orig_waiter;
@@ -283,6 +284,7 @@ static int rt_mutex_adjust_prio_chain(task_t *task,
spin_unlock_irqrestore(&task->pi_lock, flags);
out_put_task:
put_task_struct(task);
+
return ret;
}
@@ -357,7 +359,7 @@ static inline int try_to_steal_lock(struct rt_mutex *lock)
*
* Must be called with lock->wait_lock held.
*/
-static int try_to_take_rt_mutex(struct rt_mutex *lock __IP_DECL__)
+static int try_to_take_rt_mutex(struct rt_mutex *lock)
{
/*
* We have to be careful here if the atomic speedups are
@@ -384,7 +386,7 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock __IP_DECL__)
return 0;
/* We got the lock. */
- debug_rt_mutex_lock(lock __IP__);
+ debug_rt_mutex_lock(lock);
rt_mutex_set_owner(lock, current, 0);
@@ -402,13 +404,12 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock __IP_DECL__)
*/
static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
struct rt_mutex_waiter *waiter,
- int detect_deadlock
- __IP_DECL__)
+ int detect_deadlock)
{
+ struct task_struct *owner = rt_mutex_owner(lock);
struct rt_mutex_waiter *top_waiter = waiter;
- task_t *owner = rt_mutex_owner(lock);
- int boost = 0, res;
unsigned long flags;
+ int boost = 0, res;
spin_lock_irqsave(&current->pi_lock, flags);
__rt_mutex_adjust_prio(current);
@@ -454,7 +455,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
spin_unlock(&lock->wait_lock);
res = rt_mutex_adjust_prio_chain(owner, detect_deadlock, lock, waiter,
- current __IP__);
+ current);
spin_lock(&lock->wait_lock);
@@ -526,12 +527,12 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
* Must be called with lock->wait_lock held
*/
static void remove_waiter(struct rt_mutex *lock,
- struct rt_mutex_waiter *waiter __IP_DECL__)
+ struct rt_mutex_waiter *waiter)
{
int first = (waiter == rt_mutex_top_waiter(lock));
- int boost = 0;
- task_t *owner = rt_mutex_owner(lock);
+ struct task_struct *owner = rt_mutex_owner(lock);
unsigned long flags;
+ int boost = 0;
spin_lock_irqsave(&current->pi_lock, flags);
plist_del(&waiter->list_entry, &lock->wait_list);
@@ -568,7 +569,7 @@ static void remove_waiter(struct rt_mutex *lock,
spin_unlock(&lock->wait_lock);
- rt_mutex_adjust_prio_chain(owner, 0, lock, NULL, current __IP__);
+ rt_mutex_adjust_prio_chain(owner, 0, lock, NULL, current);
spin_lock(&lock->wait_lock);
}
@@ -595,7 +596,7 @@ void rt_mutex_adjust_pi(struct task_struct *task)
get_task_struct(task);
spin_unlock_irqrestore(&task->pi_lock, flags);
- rt_mutex_adjust_prio_chain(task, 0, NULL, NULL, task __RET_IP__);
+ rt_mutex_adjust_prio_chain(task, 0, NULL, NULL, task);
}
/*
@@ -604,7 +605,7 @@ void rt_mutex_adjust_pi(struct task_struct *task)
static int __sched
rt_mutex_slowlock(struct rt_mutex *lock, int state,
struct hrtimer_sleeper *timeout,
- int detect_deadlock __IP_DECL__)
+ int detect_deadlock)
{
struct rt_mutex_waiter waiter;
int ret = 0;
@@ -615,7 +616,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
spin_lock(&lock->wait_lock);
/* Try to acquire the lock again: */
- if (try_to_take_rt_mutex(lock __IP__)) {
+ if (try_to_take_rt_mutex(lock)) {
spin_unlock(&lock->wait_lock);
return 0;
}
@@ -629,7 +630,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
for (;;) {
/* Try to acquire the lock: */
- if (try_to_take_rt_mutex(lock __IP__))
+ if (try_to_take_rt_mutex(lock))
break;
/*
@@ -653,7 +654,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
*/
if (!waiter.task) {
ret = task_blocks_on_rt_mutex(lock, &waiter,
- detect_deadlock __IP__);
+ detect_deadlock);
/*
* If we got woken up by the owner then start loop
* all over without going into schedule to try
@@ -680,7 +681,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
set_current_state(TASK_RUNNING);
if (unlikely(waiter.task))
- remove_waiter(lock, &waiter __IP__);
+ remove_waiter(lock, &waiter);
/*
* try_to_take_rt_mutex() sets the waiter bit
@@ -711,7 +712,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
* Slow path try-lock function:
*/
static inline int
-rt_mutex_slowtrylock(struct rt_mutex *lock __IP_DECL__)
+rt_mutex_slowtrylock(struct rt_mutex *lock)
{
int ret = 0;
@@ -719,7 +720,7 @@ rt_mutex_slowtrylock(struct rt_mutex *lock __IP_DECL__)
if (likely(rt_mutex_owner(lock) != current)) {
- ret = try_to_take_rt_mutex(lock __IP__);
+ ret = try_to_take_rt_mutex(lock);
/*
* try_to_take_rt_mutex() sets the lock waiters
* bit unconditionally. Clean this up.
@@ -769,13 +770,13 @@ rt_mutex_fastlock(struct rt_mutex *lock, int state,
int detect_deadlock,
int (*slowfn)(struct rt_mutex *lock, int state,
struct hrtimer_sleeper *timeout,
- int detect_deadlock __IP_DECL__))
+ int detect_deadlock))
{
if (!detect_deadlock && likely(rt_mutex_cmpxchg(lock, NULL, current))) {
rt_mutex_deadlock_account_lock(lock, current);
return 0;
} else
- return slowfn(lock, state, NULL, detect_deadlock __RET_IP__);
+ return slowfn(lock, state, NULL, detect_deadlock);
}
static inline int
@@ -783,24 +784,24 @@ rt_mutex_timed_fastlock(struct rt_mutex *lock, int state,
struct hrtimer_sleeper *timeout, int detect_deadlock,
int (*slowfn)(struct rt_mutex *lock, int state,
struct hrtimer_sleeper *timeout,
- int detect_deadlock __IP_DECL__))
+ int detect_deadlock))
{
if (!detect_deadlock && likely(rt_mutex_cmpxchg(lock, NULL, current))) {
rt_mutex_deadlock_account_lock(lock, current);
return 0;
} else
- return slowfn(lock, state, timeout, detect_deadlock __RET_IP__);
+ return slowfn(lock, state, timeout, detect_deadlock);
}
static inline int
rt_mutex_fasttrylock(struct rt_mutex *lock,
- int (*slowfn)(struct rt_mutex *lock __IP_DECL__))
+ int (*slowfn)(struct rt_mutex *lock))
{
if (likely(rt_mutex_cmpxchg(lock, NULL, current))) {
rt_mutex_deadlock_account_lock(lock, current);
return 1;
}
- return slowfn(lock __RET_IP__);
+ return slowfn(lock);
}
static inline void
@@ -948,7 +949,7 @@ void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
struct task_struct *proxy_owner)
{
__rt_mutex_init(lock, NULL);
- debug_rt_mutex_proxy_lock(lock, proxy_owner __RET_IP__);
+ debug_rt_mutex_proxy_lock(lock, proxy_owner);
rt_mutex_set_owner(lock, proxy_owner, 0);
rt_mutex_deadlock_account_lock(lock, proxy_owner);
}
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