函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\cpu\umwait.c Create Date:2022-07-27 08:57:09
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：enable_c02_store

函数原型：static ssize_t enable_c02_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)

返回类型：ssize_t

参数：

类型参数名称
struct device *dev
struct device_attribute *attr
const char *buf
size_tcount
147  ret等于kstrtobool - convert common user inputs into boolean values*@s: input string*@res: result* This routine returns 0 iff the first character is one of 'Yy1Nn0', or* [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
148  如果ret则返回:ret
151  mutex_lock( & Serialize access to umwait_control_cached and IA32_UMWAIT_CONTROL MSR in* the sysfs write functions.)
153  ctrl等于READ_ONCE(Cache IA32_UMWAIT_CONTROL MSR. This is a systemwide control. By default,* umwait max time is 100000 in TSC-quanta and C0.2 is enabled)
154  如果c02_enable不等于When bit 0 in IA32_UMWAIT_CONTROL MSR is 1, C0.2 is disabled.* Otherwise, C0.2 is enabled.则umwait_update_control(ctrl, c02_enable)
157  mutex_unlock( & Serialize access to umwait_control_cached and IA32_UMWAIT_CONTROL MSR in* the sysfs write functions.)
159  返回:count