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-rw-r--r--lib/Kconfig.debug8
-rw-r--r--lib/percpu_counter.c48
2 files changed, 56 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 69a32664c28..0d5c762532a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -317,6 +317,14 @@ config DEBUG_OBJECTS_RCU_HEAD
help
Enable this to turn on debugging of RCU list heads (call_rcu() usage).
+config DEBUG_OBJECTS_PERCPU_COUNTER
+ bool "Debug percpu counter objects"
+ depends on DEBUG_OBJECTS
+ help
+ If you say Y here, additional code will be inserted into the
+ percpu counter routines to track the life time of percpu counter
+ objects and validate the percpu counter operations.
+
config DEBUG_OBJECTS_ENABLE_DEFAULT
int "debug_objects bootup default value (0-1)"
range 0 1
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 209448e1d2b..1d954ea7233 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -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;
@@ -75,6 +118,9 @@ 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 +136,8 @@ 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);