workqueue: fix freezeable workqueues implementation

Currently ->freezeable is per-cpu, this is wrong. CPU_UP_PREPARE creates
cwq->thread which is not freezeable. Move ->freezeable to workqueue_struct.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: Gautham shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5ecf498..d80dbdc 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -49,8 +49,6 @@ struct cpu_workqueue_struct {
        struct work_struct *current_work;
 
        int run_depth;          /* Detect run_workqueue() recursion depth */
-
-       int freezeable;         /* Freeze the thread during suspend */
 } ____cacheline_aligned;
 
 /*
@@ -61,6 +59,7 @@ struct workqueue_struct {
        struct cpu_workqueue_struct *cpu_wq;
        const char *name;
        struct list_head list;  /* Empty if single thread */
+       int freezeable;         /* Freeze threads during suspend */
 };
 
 /* All the per-cpu workqueues on the system, for hotplug cpu to add/remove
@@ -351,7 +350,7 @@ static int worker_thread(void *__cwq)
        struct k_sigaction sa;
        sigset_t blocked;
 
-       if (!cwq->freezeable)
+       if (!cwq->wq->freezeable)
                current->flags |= PF_NOFREEZE;
 
        set_user_nice(current, -5);
@@ -375,7 +374,7 @@ static int worker_thread(void *__cwq)
 
        set_current_state(TASK_INTERRUPTIBLE);
        while (!kthread_should_stop()) {
-               if (cwq->freezeable)
+               if (cwq->wq->freezeable)
                        try_to_freeze();
 
                add_wait_queue(&cwq->more_work, &wait);
@@ -546,7 +545,7 @@ out:
 EXPORT_SYMBOL_GPL(flush_work);
 
 static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
-                                                  int cpu, int freezeable)
+                                                       int cpu)
 {
        struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
        struct task_struct *p;
@@ -554,7 +553,6 @@ static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
        spin_lock_init(&cwq->lock);
        cwq->wq = wq;
        cwq->thread = NULL;
-       cwq->freezeable = freezeable;
        INIT_LIST_HEAD(&cwq->worklist);
        init_waitqueue_head(&cwq->more_work);
 
@@ -586,10 +584,12 @@ struct workqueue_struct *__create_workqueue(const char *name,
        }
 
        wq->name = name;
+       wq->freezeable = freezeable;
+
        mutex_lock(&workqueue_mutex);
        if (singlethread) {
                INIT_LIST_HEAD(&wq->list);
-               p = create_workqueue_thread(wq, singlethread_cpu, freezeable);
+               p = create_workqueue_thread(wq, singlethread_cpu);
                if (!p)
                        destroy = 1;
                else
@@ -597,7 +597,7 @@ struct workqueue_struct *__create_workqueue(const char *name,
        } else {
                list_add(&wq->list, &workqueues);
                for_each_online_cpu(cpu) {
-                       p = create_workqueue_thread(wq, cpu, freezeable);
+                       p = create_workqueue_thread(wq, cpu);
                        if (p) {
                                kthread_bind(p, cpu);
                                wake_up_process(p);
@@ -854,7 +854,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
                mutex_lock(&workqueue_mutex);
                /* Create a new workqueue thread for it. */
                list_for_each_entry(wq, &workqueues, list) {
-                       if (!create_workqueue_thread(wq, hotcpu, 0)) {
+                       if (!create_workqueue_thread(wq, hotcpu)) {
                                printk("workqueue for %i failed\n", hotcpu);
                                return NOTIFY_BAD;
                        }