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 13:09:39
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：trace_options_core_write

函数原型：static ssize_t trace_options_core_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
8072  tr_index等于 needed for tty driver, and maybe others
8078  In order to pass in both the trace_array descriptor as well as the index* to the flag that the trace option file represents, the trace_array* has a character array of trace_flags_index[], which holds the index* of the bit for the flag it represents
8080  ret等于kstrtoul_from_user(ubuf, cnt, 10, & val)
8081  如果ret则返回:ret
8084  如果val不等于0且val不等于1则返回:负EINVAL
8087  mutex_lock( & event_mutex)
8088  mutex_lock( & race_types_lock is used to protect the trace_types list.)
8089  ret等于set_tracer_flag(tr, 1 << index, val)
8090  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
8091  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
8093  如果ret小于0则返回:ret
8096  ppos加等于cnt
8098  返回:cnt