Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_hwlat.c Create Date:2022-07-28 12:10:58
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:hwlat_window_write - Write function for "window" 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

Proto:static ssize_t hwlat_window_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos)

Type:ssize_t

Parameter:

TypeParameterName
struct file *filp
const char __user *ubuf
size_tcnt
loff_t *ppos
492  err = kstrtoull_from_user(ubuf, cnt, 10, & val)
493  If err Then Return err
496  mutex_lock( & protect changes )
497  If active sampling portion of window < val Then al sampling window (on+off) = val
499  Else err = -EINVAL
501  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.
503  If err Then Return err
506  Return cnt