函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\rcu\rcutorture.c Create Date:2022-07-27 11:22:01
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Do one extension of an RCU read-side critical section using the* current reader state in readstate (set to zero for initial entry* to extended critical section), set the new state as specified by* newstate (set to zero for final exit from extended

函数原型：static void rcutorture_one_extend(int *readstate, int newstate, struct torture_random_state *trsp, struct rt_read_seg *rtrsp)

返回类型：void

参数：

类型参数名称
int *readstate
intnewstate
struct torture_random_state *trsp
struct rt_read_seg *rtrsp
1147  idxnew等于负1
1148  idxold等于readstate
1149  statesnew等于readstate的反按位与newstate
1150  statesold等于readstate按位与newstate的反
1152  WARN_ON_ONCE(idxold < 0)
1153  WARN_ON_ONCE((idxold >> Put SRCU index in upper bits. ) > 1)
1154  rt_readstate等于newstate
1157  如果statesnew按位与Extend readers by disabling bh. 则local_bh_disable()
1159  如果statesnew按位与... disabling interrupts. 则禁止中断()
1161  如果statesnew按位与... disabling preemption. 则禁止抢占()
1163  如果statesnew按位与... rcu_read_lock_bh(). 则_read_lock_bh() - mark the beginning of an RCU-bh critical section* This is equivalent of rcu_read_lock(), but also disables softirqs
1165  如果statesnew按位与... rcu_read_lock_sched(). 则_read_lock_sched() - mark the beginning of a RCU-sched critical section* This is equivalent of rcu_read_lock(), but disables preemption.* Read-side critical sections can also be introduced by anything else
1167  如果statesnew按位与... entering another RCU reader. 则idxnew等于readlock()左移Put SRCU index in upper bits. 位
1171  如果statesold按位与... disabling interrupts. 则开中断()
1173  如果statesold按位与Extend readers by disabling bh. 则local_bh_enable()
1175  如果statesold按位与... disabling preemption. 则禁用抢占和中断()
1177  如果statesold按位与... rcu_read_lock_bh(). 则标记rcu锁结束的软中断
1179  如果statesold按位与... rcu_read_lock_sched(). 则标记rcu锁结束
1181  如果statesold按位与... entering another RCU reader. 则readunlock(idxold >> Put SRCU index in upper bits. )
1185  如果statesnew或statesold的值且readstate且newstate则read_delay(trsp, rtrsp)
1189  如果idxnew恒等于负1则idxnew等于idxold按位与RCUTORTURE_RDR_MASK的反
1191  WARN_ON_ONCE(idxnew < 0)
1192  WARN_ON_ONCE((idxnew >> Put SRCU index in upper bits. ) > 1)
1193  readstate等于idxnew按位或newstate
1194  WARN_ON_ONCE(( * readstate >> Put SRCU index in upper bits. ) < 0)
1195  WARN_ON_ONCE(( * readstate >> Put SRCU index in upper bits. ) > 1)
调用者
名称描述
rcutorture_loop_extendDo a randomly selected number of extensions of an existing RCU read-side* critical section.
rcu_torture_one_readDo one read-side critical section, returning false if there was* no data to read. Can be invoked both from process context and* from a timer handler.