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 13:09:52
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：rb_simple_write

函数原型：static ssize_t rb_simple_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
8276  tr等于 needed for tty driver, and maybe others
8277  buffer等于buffer
8281  ret等于kstrtoul_from_user(ubuf, cnt, 10, & val)
8282  如果ret则返回:ret
8285  如果buffer则
8286  mutex_lock( & race_types_lock is used to protect the trace_types list.)
8287  如果非非val恒等于racer_tracing_is_on - show real state of ring buffer enabled*@tr : the trace array to know if ring buffer is enabled* Shows real state of the ring buffer if it is enabled or not.则
8288  val等于0
8289  否则如果val则
8290  tracer_tracing_on(tr)
8291  如果start则start(tr)
8293  否则
8294  tracer_tracing_off(tr)
8295  如果stop则stop(tr)
8298  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.
8301  ppos自加
8303  返回:cnt