函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-27 13:08:15
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：tracing_entries_write

函数原型：static ssize_t tracing_entries_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos)

返回类型：ssize_t

参数：

类型参数名称
struct file *filp
const char __user *ubuf
size_tcnt
loff_t *ppos
6390  inode等于file_inode(filp)
6391  tr等于s or device private pointer
6395  ret等于kstrtoul_from_user(ubuf, cnt, 10, & val)
6396  如果ret则返回:ret
6400  如果非val则返回:负EINVAL
6404  val左移等于10位
6405  ret等于tracing_resize_ring_buffer(tr, val, Should be used after trace_array_get(), trace_types_lock* ensures that i_cdev was already initialized.)
6406  如果ret小于0则返回:ret
6409  ppos加等于cnt
6411  返回:cnt