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plist: Remove the need to supply locks to plist heads 

This was legacy code brought over from the RT tree and
is no longer necessary.

Signed-off-by: Dima Zavin <dima@android.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Daniel Walker <dwalker@codeaurora.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Link: http://lkml.kernel.org/r/1310084879-10351-2-git-send-email-dima@android.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dima Zavin 2011-07-07 17:27:59 -07:00 committed by Ingo Molnar
parent 8edbb83e5b
commit 732375c6a5
8 changed files with 14 additions and 68 deletions
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55
include/linux/plist.h
View File

@ -77,14 +77,9 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock_types.h>
struct plist_head {
struct list_head node_list;
#ifdef CONFIG_DEBUG_PI_LIST
raw_spinlock_t *rawlock;
spinlock_t *spinlock;
#endif
};
struct plist_node {
@ -93,37 +88,13 @@ struct plist_node {
struct list_head node_list;
};
#ifdef CONFIG_DEBUG_PI_LIST
# define PLIST_HEAD_LOCK_INIT(_lock) .spinlock = _lock
# define PLIST_HEAD_LOCK_INIT_RAW(_lock) .rawlock = _lock
#else
# define PLIST_HEAD_LOCK_INIT(_lock)
# define PLIST_HEAD_LOCK_INIT_RAW(_lock)
#endif
#define _PLIST_HEAD_INIT(head) \
.node_list = LIST_HEAD_INIT((head).node_list)
/**
* PLIST_HEAD_INIT - static struct plist_head initializer
* @head: struct plist_head variable name
* @_lock: lock to initialize for this list
*/
#define PLIST_HEAD_INIT(head, _lock) \
#define PLIST_HEAD_INIT(head) \
{ \
_PLIST_HEAD_INIT(head), \
PLIST_HEAD_LOCK_INIT(&(_lock)) \
}
/**
* PLIST_HEAD_INIT_RAW - static struct plist_head initializer
* @head: struct plist_head variable name
* @_lock: lock to initialize for this list
*/
#define PLIST_HEAD_INIT_RAW(head, _lock) \
{ \
_PLIST_HEAD_INIT(head), \
PLIST_HEAD_LOCK_INIT_RAW(&(_lock)) \
.node_list = LIST_HEAD_INIT((head).node_list) \
}
/**
@ -141,31 +112,11 @@ struct plist_node {
/**
* plist_head_init - dynamic struct plist_head initializer
* @head: &struct plist_head pointer
* @lock: spinlock protecting the list (debugging)
*/
static inline void
plist_head_init(struct plist_head *head, spinlock_t *lock)
plist_head_init(struct plist_head *head)
{
INIT_LIST_HEAD(&head->node_list);
#ifdef CONFIG_DEBUG_PI_LIST
head->spinlock = lock;
head->rawlock = NULL;
#endif
}
/**
* plist_head_init_raw - dynamic struct plist_head initializer
* @head: &struct plist_head pointer
* @lock: raw_spinlock protecting the list (debugging)
*/
static inline void
plist_head_init_raw(struct plist_head *head, raw_spinlock_t *lock)
{
INIT_LIST_HEAD(&head->node_list);
#ifdef CONFIG_DEBUG_PI_LIST
head->rawlock = lock;
head->spinlock = NULL;
#endif
}
/**

4
include/linux/rtmutex.h
View File

@ -66,7 +66,7 @@ struct hrtimer_sleeper;
#define __RT_MUTEX_INITIALIZER(mutexname) \
{ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
, .wait_list = PLIST_HEAD_INIT_RAW(mutexname.wait_list, mutexname.wait_lock) \
, .wait_list = PLIST_HEAD_INIT(mutexname.wait_list) \
, .owner = NULL \
__DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
@ -100,7 +100,7 @@ extern void rt_mutex_unlock(struct rt_mutex *lock);
#ifdef CONFIG_RT_MUTEXES
# define INIT_RT_MUTEXES(tsk) \
.pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \
.pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters), \
INIT_RT_MUTEX_DEBUG(tsk)
#else
# define INIT_RT_MUTEXES(tsk)

2
kernel/fork.c
View File

@ -1013,7 +1013,7 @@ static void rt_mutex_init_task(struct task_struct *p)
{
raw_spin_lock_init(&p->pi_lock);
#ifdef CONFIG_RT_MUTEXES
plist_head_init_raw(&p->pi_waiters, &p->pi_lock);
plist_head_init(&p->pi_waiters);
p->pi_blocked_on = NULL;
#endif
}

2
kernel/futex.c
View File

@ -2697,7 +2697,7 @@ static int __init futex_init(void)
futex_cmpxchg_enabled = 1;
for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
plist_head_init(&futex_queues[i].chain, &futex_queues[i].lock);
plist_head_init(&futex_queues[i].chain);
spin_lock_init(&futex_queues[i].lock);
}

6
kernel/pm_qos_params.c
View File

@ -74,7 +74,7 @@ static DEFINE_SPINLOCK(pm_qos_lock);
static struct pm_qos_object null_pm_qos;
static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
static struct pm_qos_object cpu_dma_pm_qos = {
.requests = PLIST_HEAD_INIT(cpu_dma_pm_qos.requests, pm_qos_lock),
.requests = PLIST_HEAD_INIT(cpu_dma_pm_qos.requests),
.notifiers = &cpu_dma_lat_notifier,
.name = "cpu_dma_latency",
.target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
@ -84,7 +84,7 @@ static struct pm_qos_object cpu_dma_pm_qos = {
static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
static struct pm_qos_object network_lat_pm_qos = {
.requests = PLIST_HEAD_INIT(network_lat_pm_qos.requests, pm_qos_lock),
.requests = PLIST_HEAD_INIT(network_lat_pm_qos.requests),
.notifiers = &network_lat_notifier,
.name = "network_latency",
.target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
@ -95,7 +95,7 @@ static struct pm_qos_object network_lat_pm_qos = {
static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
static struct pm_qos_object network_throughput_pm_qos = {
.requests = PLIST_HEAD_INIT(network_throughput_pm_qos.requests, pm_qos_lock),
.requests = PLIST_HEAD_INIT(network_throughput_pm_qos.requests),
.notifiers = &network_throughput_notifier,
.name = "network_throughput",
.target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,

2
kernel/rtmutex.c
View File

@ -890,7 +890,7 @@ void __rt_mutex_init(struct rt_mutex *lock, const char *name)
{
lock->owner = NULL;
raw_spin_lock_init(&lock->wait_lock);
plist_head_init_raw(&lock->wait_list, &lock->wait_lock);
plist_head_init(&lock->wait_list);
debug_rt_mutex_init(lock, name);
}

4
kernel/sched.c
View File

@ -7781,7 +7781,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
#ifdef CONFIG_SMP
rt_rq->rt_nr_migratory = 0;
rt_rq->overloaded = 0;
plist_head_init_raw(&rt_rq->pushable_tasks, &rq->lock);
plist_head_init(&rt_rq->pushable_tasks);
#endif
rt_rq->rt_time = 0;
@ -7986,7 +7986,7 @@ void __init sched_init(void)
#endif
#ifdef CONFIG_RT_MUTEXES
plist_head_init_raw(&init_task.pi_waiters, &init_task.pi_lock);
plist_head_init(&init_task.pi_waiters);
#endif
/*

7
lib/plist.c
View File

@ -56,11 +56,6 @@ static void plist_check_list(struct list_head *top)
static void plist_check_head(struct plist_head *head)
{
WARN_ON(head != &test_head && !head->rawlock && !head->spinlock);
if (head->rawlock)
WARN_ON_SMP(!raw_spin_is_locked(head->rawlock));
if (head->spinlock)
WARN_ON_SMP(!spin_is_locked(head->spinlock));
if (!plist_head_empty(head))
plist_check_list(&plist_first(head)->prio_list);
plist_check_list(&head->node_list);
@ -180,7 +175,7 @@ static int __init plist_test(void)
unsigned int r = local_clock();
printk(KERN_INFO "start plist test\n");
plist_head_init(&test_head, NULL);
plist_head_init(&test_head);
for (i = 0; i < ARRAY_SIZE(test_node); i++)
plist_node_init(test_node + i, 0);