rcu_read_lock

函数名称：_read_lock_held() - might we be in RCU read-side critical section?* If CONFIG_DEBUG_LOCK_ALLOC is selected, returns nonzero iff in an RCU* read-side critical section

函数原型：int rcu_read_lock_held(void)

返回类型：int

参数：无

**调用者**
名称	描述
css_from_id	ss_from_id - lookup css by id@id: the cgroup id@ss: cgroup subsys to be looked into* Returns the css if there's valid one with @id, otherwise returns NULL.* Should be called under rcu_read_lock().
____bpf_map_lookup_elem	If kernel subsystem is allowing eBPF programs to call this function,* inside its own verifier_ops->get_func_proto() callback it should return* bpf_map_lookup_elem_proto, so that verifier can properly check the arguments* Different map implementations will
____bpf_map_update_elem
____bpf_map_delete_elem
__htab_map_lookup_elem	Called from syscall or from eBPF program directly, so* arguments have to match bpf_map_lookup_elem() exactly.* The return value is adjusted by BPF instructions* in htab_map_gen_lookup().
htab_map_get_next_key	Called from syscall
htab_map_update_elem	Called from syscall or from eBPF program
htab_lru_map_update_elem
__htab_percpu_map_update_elem
__htab_lru_percpu_map_update_elem
htab_map_delete_elem	Called from syscall or from eBPF program
htab_lru_map_delete_elem
xsk_map_lookup_elem
stack_map_get_next_key
__blkg_lookup_create	__blkg_lookup_create - lookup blkg, try to create one if not there@blkcg: blkcg of interest@q: request_queue of interest* Lookup blkg for the @blkcg - @q pair. If it doesn't exist, try to* create one
blkg_lookup_check	Performs queue bypass and policy enabled checks then looks up blkg.
blk_throtl_bio
find_task_by_pid_ns	Must be called under rcu_read_lock().
mem_cgroup_from_id	mem_cgroup_from_id - look up a memcg from a memcg id@id: the memcg id to look up Caller must hold rcu_read_lock().
blkg_create	If @new_blkg is %NULL, this function tries to allocate a new one as* necessary using %GFP_NOWAIT. @new_blkg is always consumed on return.
verify_new_ex	verify_new_ex - verifies if a new exception is allowed by parent cgroup's permissions@dev_cgroup: dev cgroup to be tested against@refex: new exception@behavior: behavior of the exception's dev_cgroup This is used to make sure a child cgroup won't have

函数逻辑报告