THIS_MODULE在Linux内核模块驱动程序中有何意义? [英] What is the significance of THIS_MODULE in Linux kernel module drivers?

问题描述

在Linux设备驱动程序开发中，file_operations结构使用struct module *owner.

In Linux device driver development, the file_operations structure uses struct module *owner.

• 当我们总是用THIS_MODULE初始化它时，该结构有什么用?
• 何时可以将该字段设置为NULL?

• What is the use of this structure when we always initialize it with THIS_MODULE?
• When can this field be set to NULL?

推荐答案

此字段告诉谁是struct file_operations的所有者.这样可以防止模块在运行时被卸载.使用THIS_MODULE初始化时，当前模块将保留其所有权.

This field tells who is owner of struct file_operations. This prevents module to get unloaded when it is in operation. When initialized with THIS_MODULE current module holds the ownership on it.

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