apparmor: convert profile lists to RCU based locking

Signed-off-by: John Johansen <john.johansen@canonical.com>

security/apparmor/include/apparmor.h

@@ -78,6 +78,12 @@ static inline void *kvzalloc(size_t size)
 	return __aa_kvmalloc(size, __GFP_ZERO);
 }
 
+/* returns 0 if kref not incremented */
+static inline int kref_get_not0(struct kref *kref)
+{
+	return atomic_inc_not_zero(&kref->refcount);
+}
+
 /**
  * aa_strneq - compare null terminated @str to a non null terminated substring
  * @str: a null terminated string