函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\rcu\srcutree.c Create Date:2022-07-27 11:18:48
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Returns approximate total of the readers' ->srcu_lock_count[] values* for the rank of per-CPU counters specified by idx.

函数原型：static unsigned long srcu_readers_lock_idx(struct srcu_struct *ssp, int idx)

返回类型：unsigned long

参数：

类型参数名称
struct srcu_struct *ssp
intidx
250  sum等于0
252  遍历可用CPU(cpu)
253  cpuc等于per_cpu_ptr(sda, cpu)
255  sum加等于READ_ONCE(srcu_lock_count[idx])
257  返回:sum
调用者
名称描述
srcu_readers_active_idx_checkReturn true if the number of pre-existing readers is determined to* be zero.