workqueue: kill RT workqueue

With stop_machine() converted to use cpu_stop, RT workqueue doesn't
have any user left.  Kill RT workqueue support.

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

2 files changed, 9 insertions, 17 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 9466e860d8c2..0697946c66a1 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -181,12 +181,11 @@ static inline void destroy_work_on_stack(struct work_struct *work) { }
 
 
 extern struct workqueue_struct *
-__create_workqueue_key(const char *name, int singlethread,
-                       int freezeable, int rt, struct lock_class_key *key,
-                       const char *lock_name);
+__create_workqueue_key(const char *name, int singlethread, int freezeable,
+                       struct lock_class_key *key, const char *lock_name);
 
 #ifdef CONFIG_LOCKDEP
-#define __create_workqueue(name, singlethread, freezeable, rt)  \
+#define __create_workqueue(name, singlethread, freezeable)      \
 ({                                                              \
         static struct lock_class_key __key;                     \
         const char *__lock_name;                                \
@@ -197,19 +196,18 @@ __create_workqueue_key(const char *name, int singlethread,
                 __lock_name = #name;                            \
                                                                 \
         __create_workqueue_key((name), (singlethread),          \
-                               (freezeable), (rt), &__key,      \
+                               (freezeable), &__key,            \
                                __lock_name);                    \
 })
 #else
-#define __create_workqueue(name, singlethread, freezeable, rt)  \
-        __create_workqueue_key((name), (singlethread), (freezeable), (rt), \
+#define __create_workqueue(name, singlethread, freezeable)      \
+        __create_workqueue_key((name), (singlethread), (freezeable), \
                                NULL, NULL)
 #endif
 
-#define create_workqueue(name) __create_workqueue((name), 0, 0, 0)
-#define create_rt_workqueue(name) __create_workqueue((name), 0, 0, 1)
-#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1, 0)
-#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0, 0)
+#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)
 
 extern void destroy_workqueue(struct workqueue_struct *wq);
 
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 327d2deb4451..1a47fbf92fae 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -62,7 +62,6 @@ struct workqueue_struct {
         const char *name;
         int singlethread;
         int freezeable;         /* Freeze threads during suspend */
-        int rt;
 #ifdef CONFIG_LOCKDEP
         struct lockdep_map lockdep_map;
 #endif
@@ -947,7 +946,6 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
 
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
-        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
         struct workqueue_struct *wq = cwq->wq;
         const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
         struct task_struct *p;
@@ -963,8 +961,6 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
          */
         if (IS_ERR(p))
                 return PTR_ERR(p);
-        if (cwq->wq->rt)
-                sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
         cwq->thread = p;
 
         trace_workqueue_creation(cwq->thread, cpu);
@@ -986,7 +982,6 @@ 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,
-                                                int rt,
                                                 struct lock_class_key *key,
                                                 const char *lock_name)
 {
@@ -1008,7 +1003,6 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
         lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
         wq->singlethread = singlethread;
         wq->freezeable = freezeable;
-        wq->rt = rt;
         INIT_LIST_HEAD(&wq->list);
 
         if (singlethread) {