cgroup: Add generic cgroup subsystem permission checks.
[linux-2.6.git] / kernel / irq_work.c
index f16763f..c58fa7d 100644 (file)
@@ -77,21 +77,21 @@ void __weak arch_irq_work_raise(void)
  */
 static void __irq_work_queue(struct irq_work *entry)
 {
-       struct irq_work **head, *next;
+       struct irq_work *next;
 
-       head = &get_cpu_var(irq_work_list);
+       preempt_disable();
 
        do {
-               next = *head;
+               next = __this_cpu_read(irq_work_list);
                /* Can assign non-atomic because we keep the flags set. */
                entry->next = next_flags(next, IRQ_WORK_FLAGS);
-       } while (cmpxchg(head, next, entry) != next);
+       } while (this_cpu_cmpxchg(irq_work_list, next, entry) != next);
 
        /* The list was empty, raise self-interrupt to start processing. */
        if (!irq_work_next(entry))
                arch_irq_work_raise();
 
-       put_cpu_var(irq_work_list);
+       preempt_enable();
 }
 
 /*
@@ -120,16 +120,16 @@ EXPORT_SYMBOL_GPL(irq_work_queue);
  */
 void irq_work_run(void)
 {
-       struct irq_work *list, **head;
+       struct irq_work *list;
 
-       head = &__get_cpu_var(irq_work_list);
-       if (*head == NULL)
+       if (this_cpu_read(irq_work_list) == NULL)
                return;
 
        BUG_ON(!in_irq());
        BUG_ON(!irqs_disabled());
 
-       list = xchg(head, NULL);
+       list = this_cpu_xchg(irq_work_list, NULL);
+
        while (list != NULL) {
                struct irq_work *entry = list;
 
@@ -145,7 +145,9 @@ void irq_work_run(void)
                 * Clear the BUSY bit and return to the free state if
                 * no-one else claimed it meanwhile.
                 */
-               cmpxchg(&entry->next, next_flags(NULL, IRQ_WORK_BUSY), NULL);
+               (void)cmpxchg(&entry->next,
+                             next_flags(NULL, IRQ_WORK_BUSY),
+                             NULL);
        }
 }
 EXPORT_SYMBOL_GPL(irq_work_run);