函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_hwlat.c Create Date:2022-07-27 13:17:45
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称:hwlat_width_write - Write function for "width" entry*@filp: The active open file structure*@ubuf: The user buffer that contains the value to write*@cnt: The maximum number of bytes to write to "file"*@ppos: The current position in @file* This function

函数原型:static ssize_t hwlat_width_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
453  err等于kstrtoull_from_user(ubuf, cnt, 10, & val)
454  如果err则返回:err
457  mutex_lock( & protect changes )
458  如果val小于al sampling window (on+off) active sampling portion of window 等于val
460  否则err等于负EINVAL
462  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.
464  如果err则返回:err
467  返回:cnt