workqueue: merge feature parameters into flags

Currently, __create_workqueue_key() takes @singlethread and
@freezeable paramters and store them separately in workqueue_struct.
Merge them into a single flags parameter and field and use
WQ_FREEZEABLE and WQ_SINGLE_THREAD.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index e724daf..d89cfc1 100644 (file)
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -184,13 +184,17 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
 #define work_clear_pending(work) \
        clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
 
+enum {
+       WQ_FREEZEABLE           = 1 << 0, /* freeze during suspend */
+       WQ_SINGLE_THREAD        = 1 << 1, /* no per-cpu worker */
+};
 
 extern struct workqueue_struct *
-__create_workqueue_key(const char *name, int singlethread, int freezeable,
+__create_workqueue_key(const char *name, unsigned int flags,
                       struct lock_class_key *key, const char *lock_name);
 
 #ifdef CONFIG_LOCKDEP
-#define __create_workqueue(name, singlethread, freezeable)     \
+#define __create_workqueue(name, flags)                                \
 ({                                                             \
        static struct lock_class_key __key;                     \
        const char *__lock_name;                                \
@@ -200,19 +204,20 @@ __create_workqueue_key(const char *name, int singlethread, int freezeable,
        else                                                    \
                __lock_name = #name;                            \
                                                                \
-       __create_workqueue_key((name), (singlethread),          \
-                              (freezeable), &__key,            \
+       __create_workqueue_key((name), (flags), &__key,         \
                               __lock_name);                    \
 })
 #else
-#define __create_workqueue(name, singlethread, freezeable)     \
-       __create_workqueue_key((name), (singlethread), (freezeable), \
-                              NULL, NULL)
+#define __create_workqueue(name, flags)                                \
+       __create_workqueue_key((name), (flags), NULL, NULL)
 #endif
 
-#define create_workqueue(name) __create_workqueue((name), 0, 0)
-#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1)
-#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
+#define create_workqueue(name)                                 \
+       __create_workqueue((name), 0)
+#define create_freezeable_workqueue(name)                      \
+       __create_workqueue((name), WQ_FREEZEABLE | WQ_SINGLE_THREAD)
+#define create_singlethread_workqueue(name)                    \
+       __create_workqueue((name), WQ_SINGLE_THREAD)
 
 extern void destroy_workqueue(struct workqueue_struct *wq);
 

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c56146a..68e4dd8 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -67,11 +67,10 @@ struct cpu_workqueue_struct {
  * per-CPU workqueues:
  */
 struct workqueue_struct {
+       unsigned int            flags;          /* I: WQ_* flags */
        struct cpu_workqueue_struct *cpu_wq;    /* I: cwq's */
        struct list_head        list;           /* W: list of all workqueues */
        const char              *name;          /* I: workqueue name */
-       int singlethread;
-       int freezeable;         /* Freeze threads during suspend */
 #ifdef CONFIG_LOCKDEP
        struct lockdep_map      lockdep_map;
 #endif
@@ -203,9 +202,9 @@ static const struct cpumask *cpu_singlethread_map __read_mostly;
 static cpumask_var_t cpu_populated_map __read_mostly;
 
 /* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_wq_single_threaded(struct workqueue_struct *wq)
+static inline bool is_wq_single_threaded(struct workqueue_struct *wq)
 {
-       return wq->singlethread;
+       return wq->flags & WQ_SINGLE_THREAD;
 }
 
 static const struct cpumask *wq_cpu_map(struct workqueue_struct *wq)
@@ -463,7 +462,7 @@ static int worker_thread(void *__cwq)
        struct cpu_workqueue_struct *cwq = __cwq;
        DEFINE_WAIT(wait);
 
-       if (cwq->wq->freezeable)
+       if (cwq->wq->flags & WQ_FREEZEABLE)
                set_freezable();
 
        for (;;) {
@@ -1013,8 +1012,7 @@ static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 }
 
 struct workqueue_struct *__create_workqueue_key(const char *name,
-                                               int singlethread,
-                                               int freezeable,
+                                               unsigned int flags,
                                                struct lock_class_key *key,
                                                const char *lock_name)
 {
@@ -1030,13 +1028,12 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
        if (!wq->cpu_wq)
                goto err;
 
+       wq->flags = flags;
        wq->name = name;
        lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
-       wq->singlethread = singlethread;
-       wq->freezeable = freezeable;
        INIT_LIST_HEAD(&wq->list);
 
-       if (singlethread) {
+       if (flags & WQ_SINGLE_THREAD) {
                cwq = init_cpu_workqueue(wq, singlethread_cpu);
                err = create_workqueue_thread(cwq, singlethread_cpu);
                start_workqueue_thread(cwq, -1);