#ifdef CONFIG_RCU_TLS /* Based on ax_tls.m4 */
+/*
+ * Hint: How to define/declare TLS variables of compound types
+ * such as array or function pointers?
+ *
+ * Answer: Use typedef to assign a type_name to the compound type.
+ * Example: Define a TLS variable which is an int array with len=4:
+ *
+ * typedef int my_int_array_type[4];
+ * DEFINE_URCU_TLS(my_int_array_type, var_name);
+ *
+ * Another exmaple:
+ * typedef void (*call_rcu_flavor)(struct rcu_head *, XXXX);
+ * DECLARE_URCU_TLS(call_rcu_flavor, p_call_rcu);
+ *
+ * NOTE: URCU_TLS() is NOT async-signal-safe, you can't use it
+ * inside any function which can be called from signal handler.
+ *
+ * But if pthread_getspecific() is async-signal-safe in your
+ * platform, you can make URCU_TLS() async-signal-safe via:
+ * ensuring the first call to URCU_TLS() of a given TLS variable of
+ * all threads is called earliest from a non-signal handler function.
+ *
+ * Example: In any thread, the first call of URCU_TLS(rcu_reader)
+ * is called from rcu_register_thread(), so we can ensure all later
+ * URCU_TLS(rcu_reader) in any thread is async-signal-safe.
+ *
+ * Moreover, URCU_TLS variables should not be touched from signal
+ * handlers setup with with sigaltstack(2).
+ */
+
# define DECLARE_URCU_TLS(type, name) \
- CONFIG_RCU_TLS type __tls_ ## name
+ CONFIG_RCU_TLS type name
# define DEFINE_URCU_TLS(type, name) \
- CONFIG_RCU_TLS type __tls_ ## name
+ CONFIG_RCU_TLS type name
-# define URCU_TLS(name) (__tls_ ## name)
+# define URCU_TLS(name) (name)
#else /* #ifndef CONFIG_RCU_TLS */