diff options
| -rw-r--r-- | lib/percpu-refcount.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index c69938e4b0d5..9ac959ef4cae 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -83,6 +83,7 @@ int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release, atomic_long_set(&ref->count, start_count); ref->release = release; + ref->confirm_switch = NULL; return 0; } EXPORT_SYMBOL_GPL(percpu_ref_init); @@ -102,6 +103,8 @@ void percpu_ref_exit(struct percpu_ref *ref) unsigned long __percpu *percpu_count = percpu_count_ptr(ref); if (percpu_count) { + /* non-NULL confirm_switch indicates switching in progress */ + WARN_ON_ONCE(ref->confirm_switch); free_percpu(percpu_count); ref->percpu_count_ptr = __PERCPU_REF_ATOMIC_DEAD; } |