Skip to content

L
linux
Commit 50816c48 authored by Ingo Molnar's avatar Ingo Molnar
Browse files
Options

sched/wait: Standardize internal naming of wait-queue entries 

So the various wait-queue entry variables in include/linux/wait.h
and kernel/sched/wait.c are named in a colorfully inconsistent
way:

	wait_queue_entry_t *wait
	wait_queue_entry_t *__wait	(even in plain C code!)
	wait_queue_entry_t *q		(!)
	wait_queue_entry_t *new		(making anyone who knows C++ cringe)
	wait_queue_entry_t *old

I think part of the reason for the inconsistency is the constant
apparent confusion about what a wait queue 'head' versus 'entry' is.

( Some of the documentation talks about a 'wait descriptor', which is
  the wait-queue entry itself - further adding to the confusion. )

The most common name is 'wait', but that in itself is somewhat
ambiguous as well, as it does not really make it clear whether
it's a wait-queue entry or head.

To improve all this name the wait-queue entry structure parameters
and variables consistently and push through this naming into all
the wait.h and wait.c code:

	struct wait_queue_entry *wq_entry

The 'wq_' prefix makes it easy to grep for, and we also use the
opportunity to move away from the typedef to a plain 'struct' naming:
in the kernel we typically reserve typedefs for cases where a
C structure is really small and somewhat opaque - such as pte_t.

wait-queue entries are neither small nor opaque, so use the more
standard 'struct xxx_entry' list management code nomenclature instead.

( We don't touch external users, and we preserve the typedef as well
  for actual wait-queue users, to reduce unnecessary churn. )

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ac6424b9
Show whitespace changes
Inline Side-by-side
Showing with 91 additions and 91 deletions
include/linux/wait.h
View file @ 50816c48
...@@ -11,8 +11,9 @@ ...@@ -11,8 +11,9 @@
#include <uapi/linux/wait.h> #include <uapi/linux/wait.h>
typedef struct wait_queue_entry wait_queue_entry_t; typedef struct wait_queue_entry wait_queue_entry_t;
typedef int (*wait_queue_func_t)(wait_queue_entry_t *wait, unsigned mode, int flags, void *key);
int default_wake_function(wait_queue_entry_t *wait, unsigned mode, int flags, void *key); typedef int (*wait_queue_func_t)(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key);
int default_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key);
/* wait_queue_entry::flags */ /* wait_queue_entry::flags */
#define WQ_FLAG_EXCLUSIVE 0x01 #define WQ_FLAG_EXCLUSIVE 0x01
...@@ -37,7 +38,7 @@ struct wait_bit_key { ...@@ -37,7 +38,7 @@ struct wait_bit_key {
struct wait_bit_queue { struct wait_bit_queue {
struct wait_bit_key key; struct wait_bit_key key;
wait_queue_entry_t wait; struct wait_queue_entry wait;
}; };
struct __wait_queue_head { struct __wait_queue_head {
...@@ -58,7 +59,7 @@ struct task_struct; ...@@ -58,7 +59,7 @@ struct task_struct;
.task_list = { NULL, NULL } } .task_list = { NULL, NULL } }
#define DECLARE_WAITQUEUE(name, tsk) \ #define DECLARE_WAITQUEUE(name, tsk) \
wait_queue_entry_t name = __WAITQUEUE_INITIALIZER(name, tsk) struct wait_queue_entry name = __WAITQUEUE_INITIALIZER(name, tsk)
#define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \ #define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock), \ .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
...@@ -91,19 +92,19 @@ extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct ...@@ -91,19 +92,19 @@ extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct
# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name) # define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
#endif #endif
static inline void init_waitqueue_entry(wait_queue_entry_t *q, struct task_struct *p) static inline void init_waitqueue_entry(struct wait_queue_entry *wq_entry, struct task_struct *p)
{ {
q->flags = 0; wq_entry->flags = 0;
q->private = p; wq_entry->private = p;
q->func = default_wake_function; wq_entry->func = default_wake_function;
} }
static inline void static inline void
init_waitqueue_func_entry(wait_queue_entry_t *q, wait_queue_func_t func) init_waitqueue_func_entry(struct wait_queue_entry *wq_entry, wait_queue_func_t func)
{ {
q->flags = 0; wq_entry->flags = 0;
q->private = NULL; wq_entry->private = NULL;
q->func = func; wq_entry->func = func;
} }
/** /**
...@@ -162,42 +163,41 @@ static inline bool wq_has_sleeper(wait_queue_head_t *wq) ...@@ -162,42 +163,41 @@ static inline bool wq_has_sleeper(wait_queue_head_t *wq)
return waitqueue_active(wq); return waitqueue_active(wq);
} }
extern void add_wait_queue(wait_queue_head_t *q, wait_queue_entry_t *wait); extern void add_wait_queue(wait_queue_head_t *q, struct wait_queue_entry *wq_entry);
extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait); extern void add_wait_queue_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry);
extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_entry_t *wait); extern void remove_wait_queue(wait_queue_head_t *q, struct wait_queue_entry *wq_entry);
static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_entry_t *new) static inline void __add_wait_queue(wait_queue_head_t *head, struct wait_queue_entry *wq_entry)
{ {
list_add(&new->task_list, &head->task_list); list_add(&wq_entry->task_list, &head->task_list);
} }
/* /*
* Used for wake-one threads: * Used for wake-one threads:
*/ */
static inline void static inline void
__add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait) __add_wait_queue_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
wait->flags |= WQ_FLAG_EXCLUSIVE; wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue(q, wait); __add_wait_queue(q, wq_entry);
} }
static inline void __add_wait_queue_entry_tail(wait_queue_head_t *head, static inline void __add_wait_queue_entry_tail(wait_queue_head_t *head, struct wait_queue_entry *wq_entry)
wait_queue_entry_t *new)
{ {
list_add_tail(&new->task_list, &head->task_list); list_add_tail(&wq_entry->task_list, &head->task_list);
} }
static inline void static inline void
__add_wait_queue_entry_tail_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait) __add_wait_queue_entry_tail_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
wait->flags |= WQ_FLAG_EXCLUSIVE; wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue_entry_tail(q, wait); __add_wait_queue_entry_tail(q, wq_entry);
} }
static inline void static inline void
__remove_wait_queue(wait_queue_head_t *head, wait_queue_entry_t *old) __remove_wait_queue(wait_queue_head_t *head, struct wait_queue_entry *wq_entry)
{ {
list_del(&old->task_list); list_del(&wq_entry->task_list);
} }
typedef int wait_bit_action_f(struct wait_bit_key *, int mode); typedef int wait_bit_action_f(struct wait_bit_key *, int mode);
...@@ -252,7 +252,7 @@ wait_queue_head_t *bit_waitqueue(void *, int); ...@@ -252,7 +252,7 @@ wait_queue_head_t *bit_waitqueue(void *, int);
(!__builtin_constant_p(state) || \ (!__builtin_constant_p(state) || \
state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE) \ state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE) \
extern void init_wait_entry(wait_queue_entry_t *__wait, int flags); extern void init_wait_entry(struct wait_queue_entry *wq_entry, int flags);
/* /*
* The below macro ___wait_event() has an explicit shadow of the __ret * The below macro ___wait_event() has an explicit shadow of the __ret
...@@ -269,12 +269,12 @@ extern void init_wait_entry(wait_queue_entry_t *__wait, int flags); ...@@ -269,12 +269,12 @@ extern void init_wait_entry(wait_queue_entry_t *__wait, int flags);
#define ___wait_event(wq, condition, state, exclusive, ret, cmd) \ #define ___wait_event(wq, condition, state, exclusive, ret, cmd) \
({ \ ({ \
__label__ __out; \ __label__ __out; \
wait_queue_entry_t __wait; \ struct wait_queue_entry __wq_entry; \
long __ret = ret; /* explicit shadow */ \ long __ret = ret; /* explicit shadow */ \
\ \
init_wait_entry(&__wait, exclusive ? WQ_FLAG_EXCLUSIVE : 0); \ init_wait_entry(&__wq_entry, exclusive ? WQ_FLAG_EXCLUSIVE : 0);\
for (;;) { \ for (;;) { \
long __int = prepare_to_wait_event(&wq, &__wait, state);\ long __int = prepare_to_wait_event(&wq, &__wq_entry, state);\
\ \
if (condition) \ if (condition) \
break; \ break; \
...@@ -286,7 +286,7 @@ extern void init_wait_entry(wait_queue_entry_t *__wait, int flags); ...@@ -286,7 +286,7 @@ extern void init_wait_entry(wait_queue_entry_t *__wait, int flags);
\ \
cmd; \ cmd; \
} \ } \
finish_wait(&wq, &__wait); \ finish_wait(&wq, &__wq_entry); \
__out: __ret; \ __out: __ret; \
}) })
...@@ -970,17 +970,17 @@ do { \ ...@@ -970,17 +970,17 @@ do { \
/* /*
* Waitqueues which are removed from the waitqueue_head at wakeup time * Waitqueues which are removed from the waitqueue_head at wakeup time
*/ */
void prepare_to_wait(wait_queue_head_t *q, wait_queue_entry_t *wait, int state); void prepare_to_wait(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state);
void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait, int state); void prepare_to_wait_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state);
long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_entry_t *wait, int state); long prepare_to_wait_event(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state);
void finish_wait(wait_queue_head_t *q, wait_queue_entry_t *wait); void finish_wait(wait_queue_head_t *q, struct wait_queue_entry *wq_entry);
long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout); long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout);
int woken_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key); int woken_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
int autoremove_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key); int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
int wake_bit_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key); int wake_bit_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
#define DEFINE_WAIT_FUNC(name, function) \ #define DEFINE_WAIT_FUNC(name, function) \
wait_queue_entry_t name = { \ struct wait_queue_entry name = { \
.private = current, \ .private = current, \
.func = function, \ .func = function, \
.task_list = LIST_HEAD_INIT((name).task_list), \ .task_list = LIST_HEAD_INIT((name).task_list), \
......
kernel/sched/wait.c
View file @ 50816c48
...@@ -21,34 +21,34 @@ void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct lock_c ...@@ -21,34 +21,34 @@ void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct lock_c
EXPORT_SYMBOL(__init_waitqueue_head); EXPORT_SYMBOL(__init_waitqueue_head);
void add_wait_queue(wait_queue_head_t *q, wait_queue_entry_t *wait) void add_wait_queue(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
unsigned long flags; unsigned long flags;
wait->flags &= ~WQ_FLAG_EXCLUSIVE; wq_entry->flags &= ~WQ_FLAG_EXCLUSIVE;
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
__add_wait_queue(q, wait); __add_wait_queue_entry_tail(q, wq_entry);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
EXPORT_SYMBOL(add_wait_queue); EXPORT_SYMBOL(add_wait_queue);
void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait) void add_wait_queue_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
unsigned long flags; unsigned long flags;
wait->flags |= WQ_FLAG_EXCLUSIVE; wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
__add_wait_queue_entry_tail(q, wait); __add_wait_queue_entry_tail(q, wq_entry);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
EXPORT_SYMBOL(add_wait_queue_exclusive); EXPORT_SYMBOL(add_wait_queue_exclusive);
void remove_wait_queue(wait_queue_head_t *q, wait_queue_entry_t *wait) void remove_wait_queue(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
__remove_wait_queue(q, wait); __remove_wait_queue(q, wq_entry);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
EXPORT_SYMBOL(remove_wait_queue); EXPORT_SYMBOL(remove_wait_queue);
...@@ -170,43 +170,43 @@ EXPORT_SYMBOL_GPL(__wake_up_sync); /* For internal use only */ ...@@ -170,43 +170,43 @@ EXPORT_SYMBOL_GPL(__wake_up_sync); /* For internal use only */
* loads to move into the critical region). * loads to move into the critical region).
*/ */
void void
prepare_to_wait(wait_queue_head_t *q, wait_queue_entry_t *wait, int state) prepare_to_wait(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state)
{ {
unsigned long flags; unsigned long flags;
wait->flags &= ~WQ_FLAG_EXCLUSIVE; wq_entry->flags &= ~WQ_FLAG_EXCLUSIVE;
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
if (list_empty(&wait->task_list)) if (list_empty(&wq_entry->task_list))
__add_wait_queue(q, wait); __add_wait_queue(q, wq_entry);
set_current_state(state); set_current_state(state);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
EXPORT_SYMBOL(prepare_to_wait); EXPORT_SYMBOL(prepare_to_wait);
void void
prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_entry_t *wait, int state) prepare_to_wait_exclusive(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state)
{ {
unsigned long flags; unsigned long flags;
wait->flags |= WQ_FLAG_EXCLUSIVE; wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
if (list_empty(&wait->task_list)) if (list_empty(&wq_entry->task_list))
__add_wait_queue_entry_tail(q, wait); __add_wait_queue_entry_tail(q, wq_entry);
set_current_state(state); set_current_state(state);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
EXPORT_SYMBOL(prepare_to_wait_exclusive); EXPORT_SYMBOL(prepare_to_wait_exclusive);
void init_wait_entry(wait_queue_entry_t *wait, int flags) void init_wait_entry(struct wait_queue_entry *wq_entry, int flags)
{ {
wait->flags = flags; wq_entry->flags = flags;
wait->private = current; wq_entry->private = current;
wait->func = autoremove_wake_function; wq_entry->func = autoremove_wake_function;
INIT_LIST_HEAD(&wait->task_list); INIT_LIST_HEAD(&wq_entry->task_list);
} }
EXPORT_SYMBOL(init_wait_entry); EXPORT_SYMBOL(init_wait_entry);
long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_entry_t *wait, int state) long prepare_to_wait_event(wait_queue_head_t *q, struct wait_queue_entry *wq_entry, int state)
{ {
unsigned long flags; unsigned long flags;
long ret = 0; long ret = 0;
...@@ -225,14 +225,14 @@ long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_entry_t *wait, int s ...@@ -225,14 +225,14 @@ long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_entry_t *wait, int s
* can't see us, it should wake up another exclusive waiter if * can't see us, it should wake up another exclusive waiter if
* we fail. * we fail.
*/ */
list_del_init(&wait->task_list); list_del_init(&wq_entry->task_list);
ret = -ERESTARTSYS; ret = -ERESTARTSYS;
} else { } else {
if (list_empty(&wait->task_list)) { if (list_empty(&wq_entry->task_list)) {
if (wait->flags & WQ_FLAG_EXCLUSIVE) if (wq_entry->flags & WQ_FLAG_EXCLUSIVE)
__add_wait_queue_entry_tail(q, wait); __add_wait_queue_entry_tail(q, wq_entry);
else else
__add_wait_queue(q, wait); __add_wait_queue(q, wq_entry);
} }
set_current_state(state); set_current_state(state);
} }
...@@ -284,13 +284,13 @@ EXPORT_SYMBOL(do_wait_intr_irq); ...@@ -284,13 +284,13 @@ EXPORT_SYMBOL(do_wait_intr_irq);
/** /**
* finish_wait - clean up after waiting in a queue * finish_wait - clean up after waiting in a queue
* @q: waitqueue waited on * @q: waitqueue waited on
* @wait: wait descriptor * @wq_entry: wait descriptor
* *
* Sets current thread back to running state and removes * Sets current thread back to running state and removes
* the wait descriptor from the given waitqueue if still * the wait descriptor from the given waitqueue if still
* queued. * queued.
*/ */
void finish_wait(wait_queue_head_t *q, wait_queue_entry_t *wait) void finish_wait(wait_queue_head_t *q, struct wait_queue_entry *wq_entry)
{ {
unsigned long flags; unsigned long flags;
...@@ -308,20 +308,20 @@ void finish_wait(wait_queue_head_t *q, wait_queue_entry_t *wait) ...@@ -308,20 +308,20 @@ void finish_wait(wait_queue_head_t *q, wait_queue_entry_t *wait)
* have _one_ other CPU that looks at or modifies * have _one_ other CPU that looks at or modifies
* the list). * the list).
*/ */
if (!list_empty_careful(&wait->task_list)) { if (!list_empty_careful(&wq_entry->task_list)) {
spin_lock_irqsave(&q->lock, flags); spin_lock_irqsave(&q->lock, flags);
list_del_init(&wait->task_list); list_del_init(&wq_entry->task_list);
spin_unlock_irqrestore(&q->lock, flags); spin_unlock_irqrestore(&q->lock, flags);
} }
} }
EXPORT_SYMBOL(finish_wait); EXPORT_SYMBOL(finish_wait);
int autoremove_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key)
{ {
int ret = default_wake_function(wait, mode, sync, key); int ret = default_wake_function(wq_entry, mode, sync, key);
if (ret) if (ret)
list_del_init(&wait->task_list); list_del_init(&wq_entry->task_list);
return ret; return ret;
} }
EXPORT_SYMBOL(autoremove_wake_function); EXPORT_SYMBOL(autoremove_wake_function);
...@@ -341,17 +341,17 @@ static inline bool is_kthread_should_stop(void) ...@@ -341,17 +341,17 @@ static inline bool is_kthread_should_stop(void)
* *
* p->state = mode; condition = true; * p->state = mode; condition = true;
* smp_mb(); // A smp_wmb(); // C * smp_mb(); // A smp_wmb(); // C
* if (!wait->flags & WQ_FLAG_WOKEN) wait->flags |= WQ_FLAG_WOKEN; * if (!wq_entry->flags & WQ_FLAG_WOKEN) wq_entry->flags |= WQ_FLAG_WOKEN;
* schedule() try_to_wake_up(); * schedule() try_to_wake_up();
* p->state = TASK_RUNNING; ~~~~~~~~~~~~~~~~~~ * p->state = TASK_RUNNING; ~~~~~~~~~~~~~~~~~~
* wait->flags &= ~WQ_FLAG_WOKEN; condition = true; * wq_entry->flags &= ~WQ_FLAG_WOKEN; condition = true;
* smp_mb() // B smp_wmb(); // C * smp_mb() // B smp_wmb(); // C
* wait->flags |= WQ_FLAG_WOKEN; * wq_entry->flags |= WQ_FLAG_WOKEN;
* } * }
* remove_wait_queue(&wq, &wait); * remove_wait_queue(&wq, &wait);
* *
*/ */
long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout) long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout)
{ {
set_current_state(mode); /* A */ set_current_state(mode); /* A */
/* /*
...@@ -359,7 +359,7 @@ long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout) ...@@ -359,7 +359,7 @@ long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout)
* woken_wake_function() such that if we observe WQ_FLAG_WOKEN we must * woken_wake_function() such that if we observe WQ_FLAG_WOKEN we must
* also observe all state before the wakeup. * also observe all state before the wakeup.
*/ */
if (!(wait->flags & WQ_FLAG_WOKEN) && !is_kthread_should_stop()) if (!(wq_entry->flags & WQ_FLAG_WOKEN) && !is_kthread_should_stop())
timeout = schedule_timeout(timeout); timeout = schedule_timeout(timeout);
__set_current_state(TASK_RUNNING); __set_current_state(TASK_RUNNING);
...@@ -369,13 +369,13 @@ long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout) ...@@ -369,13 +369,13 @@ long wait_woken(wait_queue_entry_t *wait, unsigned mode, long timeout)
* condition being true _OR_ WQ_FLAG_WOKEN such that we will not miss * condition being true _OR_ WQ_FLAG_WOKEN such that we will not miss
* an event. * an event.
*/ */
smp_store_mb(wait->flags, wait->flags & ~WQ_FLAG_WOKEN); /* B */ smp_store_mb(wq_entry->flags, wq_entry->flags & ~WQ_FLAG_WOKEN); /* B */
return timeout; return timeout;
} }
EXPORT_SYMBOL(wait_woken); EXPORT_SYMBOL(wait_woken);
int woken_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) int woken_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key)
{ {
/* /*
* Although this function is called under waitqueue lock, LOCK * Although this function is called under waitqueue lock, LOCK
...@@ -385,24 +385,24 @@ int woken_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void ...@@ -385,24 +385,24 @@ int woken_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void
* and is paired with smp_store_mb() in wait_woken(). * and is paired with smp_store_mb() in wait_woken().
*/ */
smp_wmb(); /* C */ smp_wmb(); /* C */
wait->flags |= WQ_FLAG_WOKEN; wq_entry->flags |= WQ_FLAG_WOKEN;
return default_wake_function(wait, mode, sync, key); return default_wake_function(wq_entry, mode, sync, key);
} }
EXPORT_SYMBOL(woken_wake_function); EXPORT_SYMBOL(woken_wake_function);
int wake_bit_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *arg) int wake_bit_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *arg)
{ {
struct wait_bit_key *key = arg; struct wait_bit_key *key = arg;
struct wait_bit_queue *wait_bit struct wait_bit_queue *wait_bit
= container_of(wait, struct wait_bit_queue, wait); = container_of(wq_entry, struct wait_bit_queue, wait);
if (wait_bit->key.flags != key->flags || if (wait_bit->key.flags != key->flags ||
wait_bit->key.bit_nr != key->bit_nr || wait_bit->key.bit_nr != key->bit_nr ||
test_bit(key->bit_nr, key->flags)) test_bit(key->bit_nr, key->flags))
return 0; return 0;
else else
return autoremove_wake_function(wait, mode, sync, key); return autoremove_wake_function(wq_entry, mode, sync, key);
} }
EXPORT_SYMBOL(wake_bit_function); EXPORT_SYMBOL(wake_bit_function);
...@@ -534,19 +534,19 @@ static inline wait_queue_head_t *atomic_t_waitqueue(atomic_t *p) ...@@ -534,19 +534,19 @@ static inline wait_queue_head_t *atomic_t_waitqueue(atomic_t *p)
return bit_waitqueue(p, 0); return bit_waitqueue(p, 0);
} }
static int wake_atomic_t_function(wait_queue_entry_t *wait, unsigned mode, int sync, static int wake_atomic_t_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync,
void *arg) void *arg)
{ {
struct wait_bit_key *key = arg; struct wait_bit_key *key = arg;
struct wait_bit_queue *wait_bit struct wait_bit_queue *wait_bit
= container_of(wait, struct wait_bit_queue, wait); = container_of(wq_entry, struct wait_bit_queue, wait);
atomic_t *val = key->flags; atomic_t *val = key->flags;
if (wait_bit->key.flags != key->flags || if (wait_bit->key.flags != key->flags ||
wait_bit->key.bit_nr != key->bit_nr || wait_bit->key.bit_nr != key->bit_nr ||
atomic_read(val) != 0) atomic_read(val) != 0)
return 0; return 0;
return autoremove_wake_function(wait, mode, sync, key); return autoremove_wake_function(wq_entry, mode, sync, key);
} }
/* /*
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7