函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\btf.c Create Date:2022-07-27 14:39:22
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：btf_get_fd_by_id

函数原型：int btf_get_fd_by_id(u32 id)

返回类型：int

参数：

类型参数名称
u32id
4252  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
4253  btf等于dr_find() - Return pointer for given ID
4254  如果非btf或非_inc_not_zero - increment a refcount unless it is 0*@r: the refcount to increment* Similar to atomic_inc_not_zero(), but will saturate at REFCOUNT_SATURATED* and WARN.* Provides no memory ordering, it is assumed the caller has guaranteed the则btf等于错误号
4256  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
4258  如果是错误则返回:错误
4261  fd等于__btf_new_fd(btf)
4262  如果fd小于0则btf_put(btf)
4265  返回:fd
调用者
名称描述
bpf_btf_get_fd_by_id