函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\locking\qspinlock.c Create Date:2022-07-27 10:51:52
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：decode_tail

函数原型：static inline __pure struct mcs_spinlock *decode_tail(unsigned int tail)

返回类型：struct mcs_spinlock

参数：

类型参数名称
unsigned inttail
126  cpu等于tail右移_Q_TAIL_CPU_OFFSET位的值减1
127  idx等于tail按位与_Q_TAIL_IDX_MASK的值右移_Q_TAIL_IDX_OFFSET位
129  返回:per_cpu_ptr( & mcs, cpu)
调用者
名称描述
queued_spin_lock_slowpathqueued_spin_lock_slowpath - acquire the queued spinlock*@lock: Pointer to queued spinlock structure*@val: Current value of the queued spinlock 32-bit word* (queue tail, pending bit, lock value)* fast : slow : unlock* : :* uncontended (0,0,0) -:--> (0,0,1)