diff options
| -rw-r--r-- | lib/Kconfig.debug | 8 | ||||
| -rw-r--r-- | lib/percpu_counter.c | 48 |
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); |