函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\ring_buffer.c Create Date:2022-07-27 12:59:54
Last Modify:2020-03-17 19:30:04 Copyright©Brick
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函数名称：The lock and unlock are done within a preempt disable section

函数原型：static __always_inline int trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer)

返回类型：int

参数：

类型参数名称
struct ring_buffer_per_cpu *cpu_buffer
2694  val等于current_context
2695  pc等于抢占计数值
2698  如果非pc按位与NMI_MASK按位或HARDIRQ_MASK按位或SOFTIRQ_OFFSET的值的值则bit等于RB_CTX_NORMAL
2700  否则bit等于如果如果pc按位与NMI_MASK则RB_CTX_NMI否则pc按位与HARDIRQ_MASK则RB_CTX_IRQ否则RB_CTX_SOFTIRQ
2704  如果此条件成立可能性小(为编译器优化)(val & (1 << (bit + nest)))则返回:1
2707  val或等于1左移bit加nest位
2708  current_context等于val
2710  返回:0
调用者
名称描述
ring_buffer_lock_reserveg_buffer_lock_reserve - reserve a part of the buffer*@buffer: the ring buffer to reserve from*@length: the length of the data to reserve (excluding event header)* Returns a reserved event on the ring buffer to copy directly to
ring_buffer_writeg_buffer_write - write data to the buffer without reserving*@buffer: The ring buffer to write to