__rcu_read_lock   144 include/linux/rcuclassic.h #define __rcu_read_lock() \
__rcu_read_lock    82 include/linux/rcupreempt.h extern void __rcu_read_lock(void)	__acquires(RCU);
__rcu_read_lock   235 kernel/rcupreempt.c void __rcu_read_lock(void)