Staging: android: timed_gpio: Request gpios.
[linux-2.6.git] / lib / percpu_counter.c
index 209448e..28f2c33 100644 (file)
@@ -8,10 +8,53 @@
 #include <linux/init.h>
 #include <linux/cpu.h>
 #include <linux/module.h>
+#include <linux/debugobjects.h>
 
 static LIST_HEAD(percpu_counters);
 static DEFINE_MUTEX(percpu_counters_lock);
 
+#ifdef CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER
+
+static struct debug_obj_descr percpu_counter_debug_descr;
+
+static int percpu_counter_fixup_free(void *addr, enum debug_obj_state state)
+{
+       struct percpu_counter *fbc = addr;
+
+       switch (state) {
+       case ODEBUG_STATE_ACTIVE:
+               percpu_counter_destroy(fbc);
+               debug_object_free(fbc, &percpu_counter_debug_descr);
+               return 1;
+       default:
+               return 0;
+       }
+}
+
+static struct debug_obj_descr percpu_counter_debug_descr = {
+       .name           = "percpu_counter",
+       .fixup_free     = percpu_counter_fixup_free,
+};
+
+static inline void debug_percpu_counter_activate(struct percpu_counter *fbc)
+{
+       debug_object_init(fbc, &percpu_counter_debug_descr);
+       debug_object_activate(fbc, &percpu_counter_debug_descr);
+}
+
+static inline void debug_percpu_counter_deactivate(struct percpu_counter *fbc)
+{
+       debug_object_deactivate(fbc, &percpu_counter_debug_descr);
+       debug_object_free(fbc, &percpu_counter_debug_descr);
+}
+
+#else  /* CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER */
+static inline void debug_percpu_counter_activate(struct percpu_counter *fbc)
+{ }
+static inline void debug_percpu_counter_deactivate(struct percpu_counter *fbc)
+{ }
+#endif /* CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER */
+
 void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
 {
        int cpu;
@@ -29,20 +72,18 @@ EXPORT_SYMBOL(percpu_counter_set);
 void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
 {
        s64 count;
-       s32 *pcount;
-       int cpu = get_cpu();
 
-       pcount = per_cpu_ptr(fbc->counters, cpu);
-       count = *pcount + amount;
+       preempt_disable();
+       count = __this_cpu_read(*fbc->counters) + amount;
        if (count >= batch || count <= -batch) {
                spin_lock(&fbc->lock);
                fbc->count += count;
-               *pcount = 0;
+               __this_cpu_write(*fbc->counters, 0);
                spin_unlock(&fbc->lock);
        } else {
-               *pcount = count;
+               __this_cpu_write(*fbc->counters, count);
        }
-       put_cpu();
+       preempt_enable();
 }
 EXPORT_SYMBOL(__percpu_counter_add);
 
@@ -75,6 +116,9 @@ int __percpu_counter_init(struct percpu_counter *fbc, s64 amount,
        fbc->counters = alloc_percpu(s32);
        if (!fbc->counters)
                return -ENOMEM;
+
+       debug_percpu_counter_activate(fbc);
+
 #ifdef CONFIG_HOTPLUG_CPU
        INIT_LIST_HEAD(&fbc->list);
        mutex_lock(&percpu_counters_lock);
@@ -90,6 +134,8 @@ void percpu_counter_destroy(struct percpu_counter *fbc)
        if (!fbc->counters)
                return;
 
+       debug_percpu_counter_deactivate(fbc);
+
 #ifdef CONFIG_HOTPLUG_CPU
        mutex_lock(&percpu_counters_lock);
        list_del(&fbc->list);