Now that we have cpu_bit_bitmap[] we don't need cpu_singlethread_map, we
can use get_cpu_mask(singlethread_cpu) directly.

Signed-off-by: Oleg Nesterov

--- K-28/kernel/workqueue.c~WQ_KILL_ST_MAP 2008-11-11 21:06:20.000000000 +0100
+++ K-28/kernel/workqueue.c 2008-11-11 21:37:46.000000000 +0100
@@ -73,7 +73,6 @@ static DEFINE_SPINLOCK(workqueue_lock);
static LIST_HEAD(workqueues);

static int singlethread_cpu __read_mostly;
-static cpumask_t cpu_singlethread_map __read_mostly;
/*
* _cpu_down() first removes CPU from cpu_online_map, then CPU_DEAD
* flushes cwq->worklist. This means that flush_workqueue/wait_on_work
@@ -92,7 +91,7 @@ static inline int is_single_threaded(str
static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
{
return is_single_threaded(wq)
- ? &cpu_singlethread_map : &cpu_populated_map;
+ ? get_cpu_mask(singlethread_cpu) : &cpu_populated_map;
}

static
@@ -980,7 +979,6 @@ void __init init_workqueues(void)
{
cpu_populated_map = cpu_online_map;
singlethread_cpu = first_cpu(cpu_possible_map);
- cpu_singlethread_map = cpumask_of_cpu(singlethread_cpu);
hotcpu_notifier(workqueue_cpu_callback, 0);
keventd_wq = create_workqueue("events");
BUG_ON(!keventd_wq);

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