函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\locking\mcs_spinlock.h Create Date:2022-07-27 10:51:51
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Releases the lock. The caller should pass in the corresponding node that* was used to acquire the lock.

函数原型：static inline void mcs_spin_unlock(struct mcs_spinlock **lock, struct mcs_spinlock *node)

返回类型：void

参数：

类型参数名称
struct mcs_spinlock **lock
struct mcs_spinlock *node
104  next等于READ_ONCE(next)
106  如果此条件成立可能性大(为编译器优化)(!next)则
110  如果此条件成立可能性大(为编译器优化)(cmpxchg_release(lock, node, NULL) == node)则返回
113  当非next等于READ_ONCE(next)循环
114  cpu_relax()
118  smp_store_release() provides a memory barrier to ensure all* operations in the critical section has been completed before* unlocking.( & 1 if lock acquired )