作为有效列表使用的% s宏表示当前会话名称，将为当前登录用户的名称。

The % s macro used as the list of valid users means the current session name, which will be the name of the currently logged in user.

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宏的第一部分将约束列表分割成多个单一约束。

The first section of the macro breaks down the list of constraints case into multiple single constraints cases.

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这通常通过list_head宏来完成，这个宏提供列表的声明和初始化。

This is commonly done with the LIST_HEAD macro, which provides the declaration and initialization of the list.

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