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 12:58:35
Last Modify:2020-03-17 19:30:04 Copyright©Brick
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函数名称：_is_head_page - test if the given page is the head page* Because the reader may move the head_page pointer, we can* not trust what the head page is (it may be pointing to* the reader page). But if the next page is a header page,

函数原型：static inline int rb_is_head_page(struct ring_buffer_per_cpu *cpu_buffer, struct buffer_page *page, struct list_head *list)

返回类型：int

参数：

类型参数名称
struct ring_buffer_per_cpu *cpu_buffer
struct buffer_page *page
struct list_head *list
874  val等于链表后项
876  如果((val & ~RB_FLAG_MASK) != (unsigned long) & list of buffer pages )则返回:PAGE_MOVED is not part of the mask
879  返回:val按位与RB_FLAG_MASK
调用者
名称描述
rb_set_head_page
rb_move_tailThis is the slow path, force gcc not to inline it.