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-rw-r--r--include/linux/workqueue.h32
-rw-r--r--kernel/workqueue.c16
2 files changed, 30 insertions, 18 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 5b13dcf..2a7b38d 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -8,16 +8,21 @@
#include <linux/timer.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
+#include <asm/atomic.h>
struct workqueue_struct;
struct work_struct;
typedef void (*work_func_t)(struct work_struct *work);
+/*
+ * The first word is the work queue pointer and the flags rolled into
+ * one
+ */
+#define work_data_bits(work) ((unsigned long *)(&(work)->data))
+
struct work_struct {
- /* the first word is the work queue pointer and the flags rolled into
- * one */
- unsigned long management;
+ atomic_long_t data;
#define WORK_STRUCT_PENDING 0 /* T if work item pending execution */
#define WORK_STRUCT_NOAUTOREL 1 /* F if work item automatically released on exec */
#define WORK_STRUCT_FLAG_MASK (3UL)
@@ -26,6 +31,9 @@ struct work_struct {
work_func_t func;
};
+#define WORK_DATA_INIT(autorelease) \
+ ATOMIC_LONG_INIT((autorelease) << WORK_STRUCT_NOAUTOREL)
+
struct delayed_work {
struct work_struct work;
struct timer_list timer;
@@ -36,13 +44,13 @@ struct execute_work {
};
#define __WORK_INITIALIZER(n, f) { \
- .management = 0, \
+ .data = WORK_DATA_INIT(0), \
.entry = { &(n).entry, &(n).entry }, \
.func = (f), \
}
#define __WORK_INITIALIZER_NAR(n, f) { \
- .management = (1 << WORK_STRUCT_NOAUTOREL), \
+ .data = WORK_DATA_INIT(1), \
.entry = { &(n).entry, &(n).entry }, \
.func = (f), \
}
@@ -82,17 +90,21 @@ struct execute_work {
/*
* initialize all of a work item in one go
+ *
+ * NOTE! No point in using "atomic_long_set()": useing a direct
+ * assignment of the work data initializer allows the compiler
+ * to generate better code.
*/
#define INIT_WORK(_work, _func) \
do { \
- (_work)->management = 0; \
+ (_work)->data = (atomic_long_t) WORK_DATA_INIT(0); \
INIT_LIST_HEAD(&(_work)->entry); \
PREPARE_WORK((_work), (_func)); \
} while (0)
#define INIT_WORK_NAR(_work, _func) \
do { \
- (_work)->management = (1 << WORK_STRUCT_NOAUTOREL); \
+ (_work)->data = (atomic_long_t) WORK_DATA_INIT(1); \
INIT_LIST_HEAD(&(_work)->entry); \
PREPARE_WORK((_work), (_func)); \
} while (0)
@@ -114,7 +126,7 @@ struct execute_work {
* @work: The work item in question
*/
#define work_pending(work) \
- test_bit(WORK_STRUCT_PENDING, &(work)->management)
+ test_bit(WORK_STRUCT_PENDING, work_data_bits(work))
/**
* delayed_work_pending - Find out whether a delayable work item is currently
@@ -143,7 +155,7 @@ struct execute_work {
* This should also be used to release a delayed work item.
*/
#define work_release(work) \
- clear_bit(WORK_STRUCT_PENDING, &(work)->management)
+ clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
extern struct workqueue_struct *__create_workqueue(const char *name,
@@ -188,7 +200,7 @@ static inline int cancel_delayed_work(struct delayed_work *work)
ret = del_timer_sync(&work->timer);
if (ret)
- clear_bit(WORK_STRUCT_PENDING, &work->work.management);
+ work_release(&work->work);
return ret;
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index db49886..742cbbe 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -96,13 +96,13 @@ static inline void set_wq_data(struct work_struct *work, void *wq)
BUG_ON(!work_pending(work));
new = (unsigned long) wq | (1UL << WORK_STRUCT_PENDING);
- new |= work->management & WORK_STRUCT_FLAG_MASK;
- work->management = new;
+ new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
+ atomic_long_set(&work->data, new);
}
static inline void *get_wq_data(struct work_struct *work)
{
- return (void *) (work->management & WORK_STRUCT_WQ_DATA_MASK);
+ return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
}
static int __run_work(struct cpu_workqueue_struct *cwq, struct work_struct *work)
@@ -133,7 +133,7 @@ static int __run_work(struct cpu_workqueue_struct *cwq, struct work_struct *work
list_del_init(&work->entry);
spin_unlock_irqrestore(&cwq->lock, flags);
- if (!test_bit(WORK_STRUCT_NOAUTOREL, &work->management))
+ if (!test_bit(WORK_STRUCT_NOAUTOREL, work_data_bits(work)))
work_release(work);
f(work);
@@ -206,7 +206,7 @@ int fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
{
int ret = 0, cpu = get_cpu();
- if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
BUG_ON(!list_empty(&work->entry));
@@ -248,7 +248,7 @@ int fastcall queue_delayed_work(struct workqueue_struct *wq,
if (delay == 0)
return queue_work(wq, work);
- if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
BUG_ON(timer_pending(timer));
BUG_ON(!list_empty(&work->entry));
@@ -280,7 +280,7 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
struct timer_list *timer = &dwork->timer;
struct work_struct *work = &dwork->work;
- if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
BUG_ON(timer_pending(timer));
BUG_ON(!list_empty(&work->entry));
@@ -321,7 +321,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
spin_unlock_irqrestore(&cwq->lock, flags);
BUG_ON(get_wq_data(work) != cwq);
- if (!test_bit(WORK_STRUCT_NOAUTOREL, &work->management))
+ if (!test_bit(WORK_STRUCT_NOAUTOREL, work_data_bits(work)))
work_release(work);
f(work);
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